USDScene : Fix crash trying to write to an open stage #1431
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johnhaddon
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In this case, `UsdStage::CreateNew()` returns a null result, which we were dereferencing, leading to a crash. We now just throw an exception describing the problem instead.
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In this case,
UsdStage::CreateNew()returns a null result, which we were dereferencing, leading to a crash. We now just throw an exception describing the problem instead.