Debounce unauthorized/forbidden InstanceExist calls

[marioreggiori]

This PR removes panics on unauthorized/forbidden introduced in #155 and instead handles invalid configuration via debounce.

Checklist

• added release notes to Unreleased section in CHANGELOG.md

References

Community Note

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[codeclimate]

Code Climate has analyzed commit be25ccf and detected 1 issue on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	1

The test coverage on the diff in this pull request is 92.5% (50% is the threshold).

This pull request will bring the total coverage in the repository to 55.7% (0.2% change).

View more on Code Climate.