Fix. Add alt text to ggplot's added to a pptx with ph_with.gg. Closes #556.

[trekonom]

This PR fixes a bug in ph_with.gg. It allows to add an alternative text to a ggplot with ph_with.gg again, thereby closing #556.

As a new feature an alt text added via ggplot2::labs is used as alt text by default if any.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 83.53%. Comparing base (338ea33) to head (226420a).
Report is 1 commits behind head on master.

Files	Patch %	Lines
R/ppt_ph_with_methods.R	80.00%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #561      +/-   ##
==========================================
+ Coverage   74.09%   83.53%   +9.44%     
==========================================
  Files          40       40              
  Lines        5609     5612       +3     
==========================================
+ Hits         4156     4688     +532     
+ Misses       1453      924     -529     

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[davidgohel]

thank you!