exit() methods should not reraise the passed-in exception (#357)

Signed-off-by: Pintaudi Giorgio <[email protected]>

Author: LastStarDust

launch_testing_ros/launch_testing_ros/wait_for_topics.py

@@ -93,8 +93,6 @@ def __enter__(self):
         return self
 
     def __exit__(self, exep_type, exep_value, trace):
-        if exep_type is not None:
-            raise Exception('Exception occured, value: ', exep_value)
         self.shutdown()