Provide default preventing slack messages being sent

opentech/apply/activity/messaging.py

@@ -102,6 +102,9 @@ class SlackAdapter(AdapterBase):
             return str(user)
 
     def send_message(self, message, user, **kwargs):
+        if not self.destination:
+            return
+
         message = ' '.join([self.slack_id(user), message])
         data = {
             "room": "CBQUCH458",

opentech/settings/production.py

@@ -106,6 +106,8 @@ else:
     }
 
 
+SLACK_DESTINATION = env.get('SLACK_DESTINATION', None)
+
 # Logging
 
 if 'LOG_DIR' in env: