Checks if batch_scanned_event is initialized before calling .set()

[pheaney-sra]

Encountered an issue where batch_scanned_event would be initialized as None and remain in this state when blocking=True on line 174. batch_scanned_event is only initialized on line 191 if blocking is False. Because the object was set to None, an AttributeError is raised.

...
CornerShot got exception - 'NoneType' object has no attribute 'set'
CornerShot unexpected exception!
Traceback (most recent call last):
  File "/home/ph/.local/lib/python3.8/site-packages/cornershot/__main__.py", line 113, in <module>
    cs.open_fire()
  File "/home/ph/.local/lib/python3.8/site-packages/cornershot/cornershot.py", line 186, in open_fire
    self._shots_manager()
  File "/home/ph/.local/lib/python3.8/site-packages/cornershot/cornershot.py", line 165, in _shots_manager
    self.batch_scanned_event.set()
AttributeError: 'NoneType' object has no attribute 'set'
...

Added checks on two lines that reference batch_scanned_event to ensure the variable is initialized before using the .set() method. Tested Cornershot with this change and the exception is no longer raised.

Please feel free to reach out if you have any questions; happy to discuss.

[sagiesec]

Good catch, thanks