post processor script fails when file is transformed from it's original source

[kisonay]

As discussed on discord: It appears that when the post-processor script plugin runs, it relies on the origin source file to be present even if the file was transformed into a different container/filename.

Relevant logs:

2023-10-28T15:43:39:INFO:Unmanic.PostProcessor - [FORMATTED] - Move file triggered by (DEFAULT) /tmp/unmanic/unmanic_file_conversion-afpbv-1698525783/2023-09-17-2259-kdaqh-1698525816.mkv --> /data/dvr/Movies/test/2023-09-17-2259.mkv

2023-10-28T15:44:44:INFO:Unmanic.EventProcessor - [FORMATTED] - Detected 'closed' event on file path '/data/dvr/Movies/test/2023-09-17-2259.mkv.unmanic.part'

2023-10-28T15:44:45:INFO:Unmanic.PostProcessor - [FORMATTED] - Removing source: /data/dvr/Movies/test/2023-09-17-2259.mpg

2023-10-28T15:17:09:ERROR:Unmanic.PluginExecutor - [FORMATTED] - Exception while carrying out 'postprocessor.task_result' plugin runner 'postprocessor_script'

Traceback (most recent call last):

  File "/usr/local/lib/python3.8/dist-packages/unmanic/libs/unplugins/executor.py", line 256, in execute_plugin_runner

    runner(data)

  File "/config/.unmanic/plugins/postprocessor_script/plugin.py", line 354, in on_postprocessor_task_results

    source_size = os.path.getsize(abspath)

  File "/usr/lib/python3.8/genericpath.py", line 50, in getsize

    return os.stat(filename).st_size

FileNotFoundError: [Errno 2] No such file or directory: "/data/dvr/Movies/test/2023-09-17-2259.mpg"

2023-10-28T15:17:09:INFO:Unmanic.PostProcessor - [FORMATTED] - Removing task cache directory '/tmp/unmanic/unmanic_file_conversion-gkgqn-1698524146'