add check for 404 service not configured

icinga-gateway-command.py

@@ -34,6 +34,10 @@ if __name__ == "__main__":
         response = requests.get(url)
 
         # check response status #
+        if response.status_code == 404:
+            print("The gateway does not have this service configured (404)")
+            sys.exit(STATUS_UNKOWN)
+
         response.raise_for_status()
 
         # validate response content #