Handle Empty Code Blocks

[wbaldoumas]

Description

Handle for scenarios where users pass empty code blocks.

Addresses #88.

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (16247e5) 100.00% compared to head (d353b60) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #89   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines           71        71           
  Branches         9        10    +1     
=========================================
  Hits            71        71           

Impacted Files	Coverage Δ
src/Markdown.ColorCode/ColorCodeBlockRenderer.cs	100.00% <100.00%> (ø)

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