Maya Plugin crashes

[sanlwy]

Description of Issue

Steps to Reproduce

1. Create a ReferenceAssembly node and load File Path testParent.usda file
   cube.usda.zip
2. Set Prim Path /set_devusdpublicwashroom_master
3. Refresh GUI and select variants old_style and static (can be any variants)
4. Select "Scene Assembly->Expanded"
   5 Expand to the leaf
   6 Select "Scene Assembly->Expanded" and maya will crash.

Seems like the issue is if we have a variantSet in a parent and we try to expand a child with different variantSet causes the plugin to crash

System Information (OS, Hardware)

Package Versions

Build Flags

[jtran56]

Filed as internal issue #151232.