[ImageEngine/cortex] 277ecc: USDScene : Fix crash trying to write to an open stage

[John Haddon]

Branch: refs/heads/RB-10.5
Home: https://github.com/ImageEngine/cortex
Commit: 277ecc8f94f9cf6459e9e26650444ab995b1aad6
https://github.com/ImageEngine/cortex/commit/277ecc8f94f9cf6459e9e26650444ab995b1aad6
Author: John Haddon <thehad...@gmail.com>
Date: 2024-09-16 (Mon, 16 Sep 2024)

Changed paths:
M Changes
M contrib/IECoreUSD/src/IECoreUSD/USDScene.cpp
M contrib/IECoreUSD/test/IECoreUSD/USDSceneTest.py

Log Message:
-----------
USDScene : Fix crash trying to write to an open stage

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.


Commit: ec54e8f906d2ab14a72572a37e9c8e7d83fc776c
https://github.com/ImageEngine/cortex/commit/ec54e8f906d2ab14a72572a37e9c8e7d83fc776c
Author: John Haddon <thehad...@gmail.com>
Date: 2024-09-16 (Mon, 16 Sep 2024)

Changed paths:
M Changes
M contrib/IECoreUSD/src/IECoreUSD/USDScene.cpp
M contrib/IECoreUSD/test/IECoreUSD/USDSceneTest.py

Log Message:
-----------
Merge pull request #1431 from johnhaddon/usdSceneNullFix

USDScene : Fix crash trying to write to an open stage


Compare: https://github.com/ImageEngine/cortex/compare/d9525b8b4cd9...ec54e8f906d2

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