ChargePoint._handle_call return response (#538)

Make `ChargePoint._handle_call` has the
response` as return value.

Author: wafa-yah

CHANGELOG.md

@@ -1,10 +1,10 @@
 # Change log
 
-
+- [#539](https://github.com/mobilityhouse/ocpp/issues/539) Add ChargePoint._handle_call return value
 - [#266](https://github.com/mobilityhouse/ocpp/issues/266) Central System documentation link
 =======
 - [#516](https://github.com/mobilityhouse/ocpp/issues/516) OCPP 2.0.1 add additional security events from v1.3
-- [#537] (https://github.com/mobilityhouse/ocpp/pull/537) Fix DataTransfer data types 
+- [#537](https://github.com/mobilityhouse/ocpp/pull/537) Fix DataTransfer data types 
 
 
 ## 0.23.0 (2023-11-30)

ocpp/charge_point.py

@@ -267,6 +267,7 @@ async def _handle_call(self, msg):
             # '_on_after' hooks are not required. Therefore ignore exception
             # when no '_on_after' hook is installed.
             pass
+        return response
 
     async def call(self, payload, suppress=True, unique_id=None):
         """