[data source] terraform apply outlog error when output nothing

[xyz5s]

Terraform v0.11.14

• provider.alicloud v1.54.0

1 .t.tf
// no vpc
data "alicloud_vpcs" "vpcs_ds" {
cidr_block = "172.16.0.0/10"
status = "Available"
name_regex = "^TF"
}

output "first_vpc_id" {
value = "${data.alicloud_vpcs.vpcs_ds.vpcs.0.id}"
}

shell>terraform apply
error: Error applying plan:

1 error occurred:
* output.first_vpc_id: Resource 'data.alicloud_vpcs.vpcs_ds' does not have attribute 'vpcs.0.id' for variable 'data.alicloud_vpcs.vpcs_ds.vpcs.0.id'

2.t.tf
// no vpc
data "alicloud_vpcs" "vpcs_ds" {
cidr_block = "172.16.0.0/10"
status = "Available"
name_regex = "^TF"
}

output "first_vpc_id" {
value = "${data.alicloud_vpcs.vpcs_ds.vpcs}"
#value = "${data.alicloud_vpcs.vpcs_ds.vpcs.0.id}"
}

shell>terraform apply
Outputs:
first_vpc_id = []

3.t.tf:
// existing vpc
data "alicloud_vpcs" "vpcs_ds" {
cidr_block = "172.16.0.0/12"
status = "Available"
name_regex = "^TF"
}

output "first_vpc_id" {
#value = "${data.alicloud_vpcs.vpcs_ds.vpcs}"
value = "${data.alicloud_vpcs.vpcs_ds.vpcs.0.id}"
}

shell>terraform apply
Outputs:
first_vpc_id = vpc-2ze2eeyclsybrka16d6jr