Packing - fix redundant texture copies - track exception when removin…

[agentyR]

Fixes in packing : file rman_operators_utils.py, class PRMAN_OT_Renderman_Package, method: execute:

• Add a test to check if the texture is already copied in the zip
• Add try/except when removing the temporary files and dir created.

[prman-pixar]

Hi @agentyR I believe there are already similar changes to your request in the "dev" branch. Can you check that branch and see if that's the case for you?

[agentyR]

Hello, I just checked the "dev" branch: thank you! It's fine then, sorry I missed that.

[prman-pixar]

Great! Thanks for confirming.