QIL improvement to common.sh: check for null return status from ECR call

[jljaco]

Issue #, if available:

Description of changes:
A small quality-of-life improvement for e2e testing workflow when running on a Mac. Currently, when one isn't logged into public.ecr.aws, you get the following when trying to run make kind-test:

10:36 $ make kind-test                                                                                                                                                                                                                                                    
2023-03-14T10:36:45 [DEBUG] Debug mode enabled                                                                                                                                                                                                                            
...
2023-03-14T10:36:47 [INFO] Building controller image ...                                                                                                                                                                                                                  
cut: stdin: Illegal byte sequence 

This change breaks one command pipeline (jq + base64 + cut + base64 + jq) into two chunks so that we can check the value returned by the first jq call to see if it's null, and exit 1 if so.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[ack-prow]

@jljaco: 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
ec2-controller-test	88896b8	link	true	/test ec2-controller-test

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[RedbackThomson]

Yeah nice
/lgtm

[jaypipes]

👍 thanks!

[jaypipes]

/lgtm

[ack-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jaypipes, jljaco, RedbackThomson

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