fix: handle errors without stack traces when using --verbose

[MichaelGoberling]

Description

Related Issue

fixes #795

Motivation and Context

How Has This Been Tested?

npm run test, locally linked plugin

Screenshots (if appropriate):

Types of changes

• [x] 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:

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

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (d1741cf) to head (3a8e0fa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #796 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 56 56 Lines 3241 3241 Branches 617 617 ========================================= Hits 3241 3241 ```

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