9b0b011f5d
Ensure that `__main__.__file__` is not set to "<blender string>" when spawning the subprocess for the background downloader. Blender sets this value when executing a Python string from C++ code. However, this value causes issues with Python's `multiprocessing` module, as it expects that IF the attribute is set, it contains the actual file of the actual main module. Clearing it works fine, as `__file__` is optional anyway. Pull Request: https://projects.blender.org/blender/blender/pulls/143985