No image name logged when denying for invalid GPG signature

[aaroncollins]

What commit ID of Portieris did you experience the problem with?

v0.10.0 (ae0bc5d)

What went wrong?

It appears that an image was denied for an invalid GPG signature but the log line didn't contain the image name:

Mar 31 12:43:12 portieris-5b7978c879-f5k5s portieris error E0331 11:43:12.067745       1 retry.go:27] Attempt 1 to verify image failed: Invalid GPG signature: (*packet.Signature)(nil)
Mar 31 12:43:12 portieris-5b7978c879-f5k5s portieris error E0331 11:43:12.067793       1 responder.go:87] simple: Invalid GPG signature: (*packet.Signature)(nil)
Mar 31 12:43:12 portieris-5b7978c879-f5k5s portieris info I0331 11:43:12.067812       1 controller.go:125] Deny for images: 

What should have happened differently?

Name of denied image should be logged

How can it be reproduced?

Attempt to deploy an image that has an invalid GPG signature

Any other relevant information