AY-7341_Arnold Scene Source workflow doesn't work with old-style sets

[dee-ynput]

Please describe the issue you have encountered?

Publishing Arnold Scene Source with legacy workflow (where you have content_SET and proxy_SET) doesn't work. It fails during the extraction:

Traceback (most recent call last):
File "C:\Users\annat\AppData\Local\Ynput\AYON\dependency_packages\ayon_2411221529_windows.zip\dependencies\pyblish\plugin.py", line 528, in __explicit_process
runner(*args)
File "C:\Users\annat\Documents\Projects\Ayon\ayon-maya\client\ayon_maya\plugins\publish\extract_arnold_scene_source.py", line 82, in process
filenames = self._extract(
^^^^^^^^^^^^^^
File "C:\Users\annat\Documents\Projects\Ayon\ayon-maya\client\ayon_maya\plugins\publish\extract_arnold_scene_source.py", line 151, in _extract
exported_files = cmds.arnoldExportAss(**kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\annat\Documents\Projects\Ayon\ayon-maya\client\ayon_maya\plugins\publish\extract_arnold_scene_source.py", line 2, in arnoldExportAss
RuntimeError: arnoldExportAss -selected needs an active selection or a list of objects
Despite the documentation of the PR changing this feature where we state that it should work for both new and old.

How to replicate the issue?

No response

Additional context:

link to discussion on Discord
(might be a private channel)

This issue was automatically created from Clickup ticket AY-7341