fix: skip process exception is there isn't one

vcsserver/hooks.py

@@ -107,7 +107,9 b' class HooksCeleryClient:'
         inquired_task = self.celery_app.signature(
             f'rhodecode.lib.celerylib.tasks.{method}'
         )
-        return inquired_task.delay(extras).get(timeout=self.TASK_TIMEOUT)
+        result = inquired_task.delay(extras).get(timeout=self.TASK_TIMEOUT)
+
+        return result
 
 
 class HooksShadowRepoClient:
@@ -157,9 +159,11 b' class SvnMessageWriter(RemoteMessageWrit'
         self.stderr.write(message)
 
 
-def _handle_exception(result):
+def _maybe_handle_exception(result):
     exception_class = result.get('exception')
     exception_traceback = result.get('exception_traceback')
+    if not (exception_class and exception_traceback):
+        return
     log.debug('Handling hook-call exception: %s', exception_class)
 
     if exception_traceback:
@@ -200,7 +204,7 b' def _call_hook(hook_name, extras, writer'
     log.debug('Hooks, using client:%s', hooks_client)
     result = hooks_client(hook_name, extras)
     log.debug('Hooks got result: %s', result)
-    _handle_exception(result)
+    _maybe_handle_exception(result)
     writer.write(result['output'])
 
     return result['status']