Remove unnecessary nested if in is_backing_instance_valid()

[dreambeyondorange]

Description of changes

• There was a double nested if statement in the is_backing_instance_valid() that was not necessary

Tests

• Ran unit tests locally

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
• Link to documentation useful to understand the changes.

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1b4ba77) 90.78% compared to head (6230caa) 90.77%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #616      +/-   ##
===========================================
- Coverage    90.78%   90.77%   -0.01%     
===========================================
  Files           20       20              
  Lines         3125     3123       -2     
===========================================
- Hits          2837     2835       -2     
  Misses         288      288              

Flag	Coverage Δ
unittests	90.77% <100.00%> (-0.01%)	⬇️

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