Catch sooner if gevent is not installed.

bazarr/main.py

@@ -5,9 +5,12 @@ bazarr_version = '0.7.2'
 # Try to import gevent and exit if it's not available. This one is required to use websocket.
 try:
     from gevent import monkey
-except ImportError as e:
+except ImportError:
+    import logging
     logging.exception('BAZARR require gevent Python module to be installed using pip.')
     try:
+        import os
+        from get_args import args
         stop_file = open(os.path.join(args.config_dir, "bazarr.stop"), "w")
     except Exception as e:
         logging.error('BAZARR Cannot create bazarr.stop file.')