Attempt to make UsdUtilsModifyAssetPaths more flexible#1282

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marktucker wants to merge 2 commits intoPixarAnimationStudios:devfrom sideeffects:dev_listop_modifycallback

+30-2

Commits on Aug 4, 2020

When using a ModifyCallback to edit a listOp, after running the modify
marktucker
committed
Skip over sublayers that map to empty paths in the resolver function.
marktucker
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