containerd: Add error handling in getImageConfig for GetImageHash. #1808

Job	Run time
packages (arm64-secure, arm64)	9m 59s
packages (ubuntu-20.04, amd64)	9m 47s
packages (ubuntu-latest, riscv64)	5m 4s
verification (arm64, kvm)	14m 49s
verification (arm64, xen)	14m 22s
eve (arm64, kvm)	42m 24s
manifest	5m 4s
eve (arm64, xen)	40m 19s
verification (amd64, kvm)	13m 4s
eve (amd64, kvm)	42m 44s
verification (amd64, xen)	12m 42s
eve (amd64, xen)	39m 31s
eve (riscv64, mini)	7m 36s
	4h 17m 25s

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