[usdShade] GetPrimvarNamesMetadataString - only append non-empty string #2131
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Description of Change(s)
on some compilers / architectures, if you do:
...this results in a default / empty string being inserted into metadata["primvars"] BEFORE GetPrimvarNamesMetadataString is called. Therefore, we only insert existing non-empty strings into the list that GetPrimvarNamesMetadataString builds. (And it's a good check in general anyway.)
For more aarch64 related fixes, also see:
Fixes Issue(s)
failure of testUsdShadeShaderDef on linux aarch64 using gcc 7.5.
I have verified that all unit tests pass with the proposed changes
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