Handle broken job log nicely

[JabLuszko]

Traceback (most recent call last):
> File "/home/ubuntu/MAD/start.py", line 262, in <module>
    asyncio.run(start(), debug=True)
  File "/usr/lib/python3.9/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "uvloop/loop.pyx", line 1517, in uvloop.loop.Loop.run_until_complete
    return future.result()
  File "/home/ubuntu/MAD/start.py", line 150, in start
    await device_updater.start_updater()
  File "/home/ubuntu/MAD/mapadroid/updater/updater.py", line 83, in start_updater
    await self._load_log()
  File "/home/ubuntu/MAD/mapadroid/updater/updater.py", line 68, in _load_log
    issued_job: GlobalJobLogEntry = self._global_job_log_entry_schema.load(issued_job_raw)
  File "/home/ubuntu/mad_env/lib/python3.9/site-packages/marshmallow_dataclass/__init__.py", line 752, in load
    all_loaded = super().load(data, many=many, **kwargs)
  File "/home/ubuntu/mad_env/lib/python3.9/site-packages/marshmallow/schema.py", line 722, in load
    return self._do_load(
  File "/home/ubuntu/mad_env/lib/python3.9/site-packages/marshmallow/schema.py", line 909, in _do_load
    raise exc
marshmallow.exceptions.ValidationError: {'auto_command_settings': {'start_with_init': ['Missing data for required field.'], 'redo_on_error': ['Missing data for required field.'], 'redo': ['Missing data for required field.'], 'algo_value': ['Missing data for required field.'], 'origins': ['Missing data for required field.'], 'job': ['Missing data for required field.']}} 

Catch this marshmallow.exceptions.ValidationError nicely, remove file, re-load empty file(?), show warning, start MAD normally.