don't crash if files.que is not present

production_pinder-butler | '2019-06-05 10:51:42,967:INFO:Processing queue /bot/watchDir/files.que'
production_pinder-butler | '2019-06-05 10:51:42,967:DEBUG:Attempting to acquire lock 139923312674240 on /bot/watchDir/files.que.lock'
production_pinder-butler | '2019-06-05 10:51:42,967:INFO:Lock 139923312674240 acquired on /bot/watchDir/files.que.lock'
production_pinder-butler | '2019-06-05 10:51:42,968:DEBUG:Attempting to release lock 139923312674240 on /bot/watchDir/files.que.lock'
production_pinder-butler | Traceback (most recent call last):
production_pinder-butler |   File "/bot/src/main.py", line 59, in <module>
production_pinder-butler | '2019-06-05 10:51:42,968:INFO:Lock 139923312674240 released on /bot/watchDir/files.que.lock'
production_pinder-butler |     processQueue()
production_pinder-butler |   File "/bot/src/main.py", line 24, in processQueue
production_pinder-butler |     with open(queueFile, "r") as f:
production_pinder-butler | FileNotFoundError: [Errno 2] No such file or directory: '/bot/watchDir/files.que'
production_pinder-butler exited with code 1

we should handle the case if the files.que file is not present initially and simply create the file in this case...