/event report returns NoneType error if no event exists in the database.

[njyjn]

/event report

2017-02-05 01:44:18,802 : INFO     Received '/event report' from 'Justin' (87244565)
Traceback (most recent call last):
  File "/home/justin/.local/lib/python3.5/site-packages/telepot/delegate.py", line 256, in wait_loop
    j.on_message(msg)
  File "/home/justin/.local/lib/python3.5/site-packages/telepot/helper.py", line 630, in augmented
    return handler(msg)
  File "/home/justin/.local/lib/python3.5/site-packages/telepot/helper.py", line 996, in on_message
    self._router.route(msg)
  File "/home/justin/.local/lib/python3.5/site-packages/telepot/helper.py", line 972, in route
    return fn(msg, *args, **kwargs)
  File "/home/justin/.local/lib/python3.5/site-packages/telepot/helper.py", line 980, in <lambda>
    self._router = Router(flavor, {'chat': lambda msg: self.on_chat_message(msg),
  File "main.py", line 183, in on_chat_message
    reply(manager.printGrandTally())
  File "/home/justin/webprojects/AttendanceBot/manager.py", line 409, in printGrandTally
    total = getFinalString(tally.find_one( { } ))
  File "/home/justin/webprojects/AttendanceBot/manager.py", line 387, in getFinalString
    total = str(cgDoc['total'])
TypeError: 'NoneType' object is not subscriptable
2017-02-05 01:44:18,807 : ERROR    on_close() called due to TypeError: 'NoneType' object is not subscriptable

Add try-except block to handle error, and send user an appropriate message.

[njyjn]

This error is caused by the way the getFinalString() method is being overloaded. The way to fix this is to throw an error reply if no event is ongoing.

[njyjn]

Issue was fixed in headmaster.py with 9959b1d2038a38ce7113d856d5ca87f7f6258052 where cg['...'] was returning KeyError due to unpopulated field.

Fix: Use .get(..., 0) to enforce 0.

Now /event report returns an empty list which is a temporary fix. In the future, we need to pull up a 'no event error' or something.