UsdIn does NOT load NurbsCurves

[sun-frog]

Describe the bug UsdIn does NOT load nurbscurves

Steps to reproduce

1. Usd export nurbs curves from a program like maya

2. Load the exported usd nurbs curves with UsdIn

Expected behavior UsdIn should load nurbs curves like alembic

Attachments test_usd_nurbs_curves.zip

Specs (if applicable):

• OS & version centos 7
• Compiler & version gcc 6.3.1
• Katana version Katana 5.0v1
• Katana USD commit 2bb14a941e1aa14c26d1b500bff16e1df6b20ef2 / tag 21.05_fn5_py3

Additional context I have tested the usd nurbs curves import with Katana versions:

• 4.0v8 default usd
• 5.0v1 default usd
• 5.0v1 with compiled usd tag 21.05_fn5_py3 compiled with the default build option from the BUILD.md cmake .. \ -DCMAKE_BUILD_TYPE="Release" \ -DKATANA_API_LOCATION= \ -DUSE_KATANA_THIRDPARTY_LIBS=ON \ -DCMAKE_INSTALL_PREFIX="/path/to/usd_for_katana/install" cmake --build . --target install --config Release --parallel 8