#5450 [BUG] When triggering a remote LP, Flytekit fails with TypeError: 'NoneType' object is not subscriptable Issue created by RRap0so Describe the bug Flytekit version: v1.12.2 When triggering a remote LaunchPlan execution, Flytekit is unable to process certain output types. In our tests we're getting the following error.

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
    result = handle(
../../test_util/remote_util.py:30: in handle
    return self._execute_and_assert(remote_entity, **kwargs)
../../test_util/remote_util.py:47: in _execute_and_assert
    return RemoteHandler._outputs(execution)
../../test_util/remote_util.py:55: in _outputs
    values = [value for value in execution.outputs.values()]
../../test_util/remote_util.py:55: in <listcomp>
    values = [value for value in execution.outputs.values()]
../../../../../../.pyenv/versions/3.10.13/lib/python3.10/_collections_abc.py:930: in __iter__
    yield self._mapping[key]
../../../.venv/lib/python3.10/site-packages/flytekit/core/type_engine.py:2196: in __getitem__
    return self.get(key)
../../../.venv/lib/python3.10/site-packages/flytekit/core/type_engine.py:2225: in get
    val = TypeEngine.to_python_value(
../../../.venv/lib/python3.10/site-packages/flytekit/core/type_engine.py:1187: in to_python_value
    return transformer.to_python_value(ctx, lv, expected_python_type)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = Python Dictionary Transforms (<class 'dict'>) to Flyte native
ctx = FlyteContext(file_access=<flytekit.core.data_persistence.FileAccessProvider object at 0x1042ffe20>, level=2, flyte_cli...0x1036bd6c0>), serialization_settings=None, in_a_condition=False, origin_stackframe=None, output_metadata_tracker=None)
lv = <FlyteLiteral(Literal) scalar { generic { fields { key: "error" value { null_value: NULL_VALUE } } } }>
expected_python_type = <class 'dict'>

    def to_python_value(self, ctx: FlyteContext, lv: Literal, expected_python_type: Type[dict]) -> dict:
        if lv and lv.map and lv.map.literals is not None:
            tp = self.dict_types(expected_python_type)
    
            if tp is None or tp[0] is None:
                raise TypeError(
                    "TypeMismatch: Cannot convert to python dictionary from Flyte Literal Dictionary as the given "
                    "dictionary does not have sub-type hints or they do not match with the originating dictionary "
                    "source. Flytekit does not currently support implicit conversions"
                )
            if tp[0] != str:
                raise TypeError("TypeMismatch. Destination dictionary does not accept 'str' key")
            py_map = {}
            for k, v in lv.map.literals.items():
                py_map[k] = TypeEngine.to_python_value(ctx, v, cast(Type, tp[1]))
            return py_map
    
        # for empty generic we have to explicitly test for lv.scalar.generic is not None as empty dict
        # evaluates to false
        if lv and lv.scalar and lv.scalar.generic is not None:
>           if lv.metadata["format"] == "json":
E           TypeError: 'NoneType' object is not subscriptable

../../../.venv/lib/python3.10/site-packages/flytekit/core/type_engine.py:1809: TypeError

Process finished with exit code 1

Expected behavior Outputs should be properly returned. Additional context to reproduce Trigger a remote launchplan that returns

<FlyteLiteral(Literal) scalar { generic { fields { key: "error" value { null_value: NULL_VALUE } } } }>

this won't have the

metadata

field set and in turn fail to process. We believe this bug was introduced with the following PR Screenshots No response Are you sure this issue hasn't been raised already? ☑︎ Yes Have you read the Code of Conduct? ☑︎ Yes flyteorg/flyte