Allow IParagraphPortion.Font to be null #713
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In our usage, we found instances where TextFrame.ShrinkText would throw a null reference exception due to ContentFrames not having font's for every portion. Changed IParagraphPortion to be nullable and cleaned up code so that it can skip null fonts
PR-Codex overview
This PR updates nullable references in text handling classes for font properties.
Detailed summary
Font
property nullable inIParagraphPortion.cs
.IParagraph.cs
.TextFrame.cs
.