Don't break groups in case one handler raises an unhandled exception

The error is logged instead. Fixes #126

pyrogram/client/dispatcher/dispatcher.py

@@ -90,6 +90,7 @@ class Dispatcher:
 
     def dispatch(self, update, users: dict = None, chats: dict = None, is_raw: bool = False):
         for group in self.groups.values():
+            try:
                 for handler in group:
                     if is_raw:
                         if not isinstance(handler, RawUpdateHandler):
@@ -127,6 +128,8 @@ class Dispatcher:
 
                     handler.callback(*args)
                     break
+            except Exception as e:
+                log.error(e, exc_info=True)
 
     def update_worker(self):
         name = threading.current_thread().name