Update exasol_udf_mock_python/mock_context.py

Co-authored-by: Torsten Kilias <[email protected]>

exasol_udf_mock_python/mock_context.py

@@ -28,7 +28,7 @@ def __init__(self, input_groups: Iterator[Group], metadata: MockMetaData):
         self._input_groups = input_groups
         self._metadata = metadata
         """ Mock context for the current group """
-        self._current = None            # type: Optional[StandaloneMockContext]
+        self._current:Optional[StandaloneMockContext] = None
         """ Output for all groups """
         self._previous_groups = []        # type: List[Group]