`Convert_Pester_Coverage`: No longer throws an exception

[johlju]

Pull Request

Pull Request (PR) description

Fixed

• Task Convert_Pester_Coverage
  • No longer throws an exception when there was just one missed command for a test suite. Fixes #407.

Task list

• [x] The PR represents a single logical change. i.e. Cosmetic updates should go in different PRs.
• [x] Added an entry under the Unreleased section of in the CHANGELOG.md as per format.
• [x] Local clean build passes without issue or fail tests (build.ps1 -ResolveDependency).
• [ ] Documentation added/updated in README.md.
• [ ] Comment-based help added/updated.
• [ ] Localization strings added/updated in all localization files as appropriate.
• [x] Unit tests added/updated. See DSC Community Testing Guidelines.
• [ ] Integration tests added/updated (where possible). See DSC Community Testing Guidelines.
• [x] New/changed code adheres to DSC Community Style Guidelines.

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This change is 

[codecov[bot]]

Codecov Report

Merging #408 (c3a9dd0) into main (3aa327f) will increase coverage by 0%. The diff coverage is 100%.

@@         Coverage Diff         @@
##           main   #408   +/-   ##
===================================
  Coverage    81%    81%           
===================================
  Files        42     42           
  Lines      2244   2248    +4     
===================================
+ Hits       1825   1835   +10     
+ Misses      419    413    -6     

Impacted Files	Coverage Δ
.build/tasks/JaCoCo.coverage.build.ps1	77% <100%> (+3%)	:arrow_up:

[johlju]

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