DrawTextProcessor - Handle Empty Paths

[JimBobSquarePants]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules 👮.
• I have provided test coverage for my change (where applicable)

Description

I discovered this issue while testing the Fonts library. The fix was simple enough but I added some additional refactoring of the test font loading in the test code to make future testing easier.

[codecov]

Codecov Report

Merging #152 (81385ac) into master (0849d85) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
+ Coverage   69.85%   69.86%   +0.01%     
==========================================
  Files          90       90              
  Lines        5139     5141       +2     
  Branches     1048     1049       +1     
==========================================
+ Hits         3590     3592       +2     
  Misses       1338     1338              
  Partials      211      211              

Flag	Coverage Δ
unittests	69.86% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
...ssing/Processors/Text/DrawTextProcessor{TPixel}.cs	97.18% <100.00%> (+0.02%)	⬆️

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