fix: armclient panic when response is nil

[andyzhangx]

What type of PR is this?

/kind bug

What this PR does / why we need it:

fix: armclient panic when response is nil

2022-03-08T04:31:40.4980663Z stderr F I0308 04:31:40.497552    3996 utils.go:76] GRPC call: /csi.v1.Node/NodeStageVolume
2022-03-08T04:31:40.4980663Z stderr F I0308 04:31:40.498066    3996 utils.go:77] GRPC request: {"staging_target_path":"\\var\\lib\\kubelet\\plugins\\kubernetes.io\\csi\\pv\\pvc-5803bec1-eb0b-4c69-ad8f-149884af0ec8\\globalmount","volume_capability":{"AccessType":{"Mount":{"mount_flags":["dir_mode=0777","file_mode=0777","mfsymlinks","cache=strict","nosharesock","actimeo=30"]}},"access_mode":{"mode":5}},"volume_context":{"csi.storage.k8s.io/pv/name":"pvc-5803bec1-eb0b-4c69-ad8f-149884af0ec8","csi.storage.k8s.io/pvc/name":"pvc-azurefile","csi.storage.k8s.io/pvc/namespace":"default","secretnamespace":"default","skuName":"Standard_LRS","storage.kubernetes.io/csiProvisionerIdentity":"1646710363539-8081-file.csi.azure.com"},"volume_id":"capz-bu4wzi#f1e23b0af9d594ab8a66e92#pvc-5803bec1-eb0b-4c69-ad8f-149884af0ec8#"}
2022-03-08T04:31:40.4985572Z stderr F I0308 04:31:40.498557    3996 round_trippers.go:553] GET https://10.96.0.1:443/api/v1/namespaces/default/secrets/azure-storage-account-f1e23b0af9d594ab8a66e92-secret  in 0 milliseconds
2022-03-08T04:31:40.4985572Z stderr F I0308 04:31:40.498557    3996 azurefile.go:606] could not get account(f1e23b0af9d594ab8a66e92) key from secret(azure-storage-account-f1e23b0af9d594ab8a66e92-secret), error: could not get secret(azure-storage-account-f1e23b0af9d594ab8a66e92-secret): Get "https://10.96.0.1:443/api/v1/namespaces/default/secrets/azure-storage-account-f1e23b0af9d594ab8a66e92-secret": dial tcp 10.96.0.1:443: connectex: A socket operation was attempted to an unreachable network., use cluster identity to get account key instead
2022-03-08T04:31:40.5141712Z stderr F panic: runtime error: invalid memory address or nil pointer dereference
2022-03-08T04:31:40.5141712Z stderr F [signal 0xc0000005 code=0x0 addr=0x10 pc=0x1946950]
2022-03-08T04:31:40.5141712Z stderr F 
2022-03-08T04:31:40.5141712Z stderr F goroutine 81 [running]:
2022-03-08T04:31:40.5145534Z stderr F sigs.k8s.io/cloud-provider-azure/pkg/azureclients/armclient.DoHackRegionalRetryDecorator.func1.1(0xc00009e100)
2022-03-08T04:31:40.5145534Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/sigs.k8s.io/cloud-provider-azure/pkg/azureclients/armclient/azure_armclient.go:162 +0x90
2022-03-08T04:31:40.515566Z stderr F github.com/Azure/go-autorest/autorest.SenderFunc.Do(0x2353760, 0xc0000a5830)
2022-03-08T04:31:40.515566Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/github.com/Azure/go-autorest/autorest/sender.go:84 +0x1f
2022-03-08T04:31:40.515566Z stderr F github.com/Azure/go-autorest/autorest.SendWithSender({0x2353760, 0xc0000a5830}, 0xc0001f6210, {0xc0004cae28, 0x5, 0x6})
2022-03-08T04:31:40.515566Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/github.com/Azure/go-autorest/autorest/sender.go:126 +0x44
2022-03-08T04:31:40.515566Z stderr F sigs.k8s.io/cloud-provider-azure/pkg/azureclients/armclient.(*Client).sendRequest(0xc00048f1e0, 0x2382b78)
2022-03-08T04:31:40.515566Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/sigs.k8s.io/cloud-provider-azure/pkg/azureclients/armclient/azure_armclient.go:223 +0xeb
2022-03-08T04:31:40.515566Z stderr F sigs.k8s.io/cloud-provider-azure/pkg/azureclients/armclient.(*Client).PostResource(0x19, {0x2382b78, 0xc0001f6210}, {0xc0004fe140, 0x92}, {0x20fdf46, 0x8}, {0x1e2ff60, 0x32c7ad0}, 0xc0001f70b0)
2022-03-08T04:31:40.515566Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/sigs.k8s.io/cloud-provider-azure/pkg/azureclients/armclient/azure_armclient.go:699 +0x45a
2022-03-08T04:31:40.515566Z stderr F sigs.k8s.io/cloud-provider-azure/pkg/azureclients/storageaccountclient.(*Client).listStorageAccountKeys(0xc000498800, {0x2382b78, 0xc0001f6210}, {0xc00003a5f0, 0x1f0eef65f1}, {0xc00003a5fc, 0xc00003a5f0})
2022-03-08T04:31:40.515566Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/sigs.k8s.io/cloud-provider-azure/pkg/azureclients/storageaccountclient/azure_storageaccountclient.go:190 +0x123
2022-03-08T04:31:40.515566Z stderr F sigs.k8s.io/cloud-provider-azure/pkg/azureclients/storageaccountclient.(*Client).ListKeys(0xc000498800, {0x2382b78, 0xc0001f6210}, {0xc00003a5f0, 0xb}, {0xc00003a5fc, 0x17})
2022-03-08T04:31:40.5160683Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/sigs.k8s.io/cloud-provider-azure/pkg/azureclients/storageaccountclient/azure_storageaccountclient.go:166 +0x29e
2022-03-08T04:31:40.5160683Z stderr F sigs.k8s.io/cloud-provider-azure/pkg/provider.(*Cloud).GetStorageAccesskey(0xc0001f7050, {0x2382b78, 0xc0001f6210}, {0xc00003a5fc, 0x34}, {0xc00003a5f0, 0x0})
2022-03-08T04:31:40.5160683Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/sigs.k8s.io/cloud-provider-azure/pkg/provider/azure_storageaccount.go:101 +0x67
2022-03-08T04:31:40.5160683Z stderr F sigs.k8s.io/azurefile-csi-driver/pkg/azurefile.(*Driver).GetAccountInfo(0xc00017a780, {0x2382b78, 0xc0001f6210}, {0xc00003a5f0, 0x4d}, 0x0, 0xc0000d8c00)
2022-03-08T04:31:40.5160683Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/azurefile.go:607 +0xe5b
2022-03-08T04:31:40.5160683Z stderr F sigs.k8s.io/azurefile-csi-driver/pkg/azurefile.(*Driver).NodeStageVolume(0xc00017a780, {0x2382b78, 0xc0001f6210}, 0xc000425800)
2022-03-08T04:31:40.5160683Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/azurefile/nodeserver.go:159 +0x28a
2022-03-08T04:31:40.5170542Z stderr F github.com/container-storage-interface/spec/lib/go/csi._Node_NodeStageVolume_Handler.func1({0x2382b78, 0xc0001f6210}, {0x2011de0, 0xc000425800})
2022-03-08T04:31:40.5170542Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/github.com/container-storage-interface/spec/lib/go/csi/csi.pb.go:6110 +0x78
2022-03-08T04:31:40.5170542Z stderr F sigs.k8s.io/azurefile-csi-driver/pkg/csi-common.logGRPC({0x2382b78, 0xc0001f6210}, {0x2011de0, 0xc000425800}, 0xc000410da0, 0xc00031ff20)
2022-03-08T04:31:40.5170542Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/pkg/csi-common/utils.go:79 +0x3c7
2022-03-08T04:31:40.5170542Z stderr F github.com/container-storage-interface/spec/lib/go/csi._Node_NodeStageVolume_Handler({0x20c0ba0, 0xc00017a780}, {0x2382b78, 0xc0001f6210}, 0xc0004257a0, 0x21dc6b0)
2022-03-08T04:31:40.5170542Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/github.com/container-storage-interface/spec/lib/go/csi/csi.pb.go:6112 +0x138
2022-03-08T04:31:40.5170542Z stderr F google.golang.org/grpc.(*Server).processUnaryRPC(0xc0002db500, {0x23b1c98, 0xc000310180}, 0xc0002ba5a0, 0xc0002039b0, 0x3257ac0, 0x0)
2022-03-08T04:31:40.5170542Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/google.golang.org/grpc/server.go:1282 +0xccf
2022-03-08T04:31:40.5170542Z stderr F google.golang.org/grpc.(*Server).handleStream(0xc0002db500, {0x23b1c98, 0xc000310180}, 0xc0002ba5a0, 0x0)
2022-03-08T04:31:40.5170542Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/google.golang.org/grpc/server.go:1616 +0xa2a
2022-03-08T04:31:40.5170542Z stderr F google.golang.org/grpc.(*Server).serveStreams.func1.2()
2022-03-08T04:31:40.5170542Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/google.golang.org/grpc/server.go:921 +0x98
2022-03-08T04:31:40.5170542Z stderr F created by google.golang.org/grpc.(*Server).serveStreams.func1
2022-03-08T04:31:40.5175511Z stderr F 	/home/prow/go/src/sigs.k8s.io/azurefile-csi-driver/vendor/google.golang.org/grpc/server.go:919 +0x294

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

fix: armclient panic when response is nil

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

fix: armclient panic when response is nil

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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[andyzhangx]

/test pull-kubernetes-e2e-capz-blob

[andyzhangx]

/retest

[k8s-ci-robot]

@andyzhangx: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-e2e-capz-blob	ff1e4c8	link	false	/test pull-kubernetes-e2e-capz-blob

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