Always run txn.after_callbacks

synapse/storage/_base.py

@@ -305,11 +305,12 @@ class SQLBaseStore(object):
                     func, *args, **kwargs
                 )
 
+        try:
             with PreserveLoggingContext():
                 result = yield self._db_pool.runWithConnection(
                     inner_func, *args, **kwargs
                 )
-
+        finally:
             for after_callback, after_args in after_callbacks:
                 after_callback(*after_args)
         defer.returnValue(result)