Handle nullable primitives before passing them to WritePrimitive… #54800
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Handle nullable primitives before passing them to WritePrimitive which expects non-null values.
XmlSerializer's
WritePrimitive
method is written to expect non-null values.But primitive types can be nullable, and can be expected to be nullable in
serialization. This fix will check for a null primitive value before passing off to
WritePrimitive
since null primitives are a simple null tag to write.Fixes #421