fix(registry-scanner): handle error for fips image

[hayk99]

What this PR does / why we need it:

Checklist

• Title of the PR starts with type and scope, (e.g. feat(agent,node-analyzer,sysdig-deploy):)
• Chart Version bumped for the respective charts
• Variables are documented in the README.md (or README.tpl in some charts)
• Check GithubAction checks (like lint) to avoid merge-check stoppers
• All test files are added in the tests folder of their respective chart and have a "_test" suffix

[github-actions]

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Check PR guidelines at https://github.com/sysdiglabs/charts/blob/main/README.md#pull-requests

All good!

[dbonino]

LGTM