Fix the NPR issue when Font.getTypeface() returns nullptr.

[domchen]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 13.33333% with 13 lines in your changes missing coverage. Please review.

Project coverage is 61.62%. Comparing base (b6ce2a5) to head (5ddce8c).
Report is 19 commits behind head on main.

Files with missing lines	Patch %	Lines
src/rendering/utils/shaper/TextShaperHarfbuzz.cpp	33.33%	2 Missing and 2 partials ⚠️
src/rendering/graphics/Glyph.cpp	0.00%	0 Missing and 3 partials ⚠️
src/rendering/caches/TextAtlas.cpp	0.00%	0 Missing and 2 partials ⚠️
src/rendering/caches/TextBlock.cpp	0.00%	0 Missing and 1 partial ⚠️
src/rendering/caches/TextContentCache.cpp	0.00%	0 Missing and 1 partial ⚠️
src/rendering/graphics/Text.cpp	0.00%	0 Missing and 1 partial ⚠️
src/rendering/utils/shaper/TextShaperPrimitive.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2266      +/-   ##
==========================================
+ Coverage   61.53%   61.62%   +0.09%     
==========================================
  Files         385      385              
  Lines       22064    22063       -1     
  Branches     6420     6422       +2     
==========================================
+ Hits        13577    13597      +20     
+ Misses       4445     4442       -3     
+ Partials     4042     4024      -18     

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