fix: not all missing files errors are because of an invalid root folder

[MichaelGoberling]

Description

Fixes #646

Related Issue

#646

Motivation and Context

How Has This Been Tested?

npm run test, locally linked plugin

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1f35c49) 100.00% compared to head (ea02740) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #755   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           56        56           
  Lines         3234      3227    -7     
  Branches       612       611    -1     
=========================================
- Hits          3234      3227    -7     

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