Better runtime execution tracebacks

[kindermax]

Case - when there is no entity in database but link still returns entity id, later in Node field mapper we receive None, hence AttributeError: 'NoneType' object has no attribute 'get_key'

We need to make this errors/traceback better. At least we must see some execution info suck as query/node/field/mapper etc.

Traceback

Traceback (most recent call last):
  # File "/usr/local/lib/python3.13/dist-packages/app/controllers/graph.py", line 95, in wrapper
    return func(*args, **kwargs)
  File "<decorator-gen-0>", line 2, in graphql
  File "/usr/local/lib/python3.13/dist-packages/app/controllers/graph.py", line 72, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.13/dist-packages/app/controllers/graph.py", line 189, in graphql
    return loop.run_until_complete(
           ~~~~~~~~~~~~~~~~~~~~~~~^
        endpoint.dispatch(request_data)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    )
    ^
  File "/usr/lib/python3.13/asyncio/base_events.py", line 725, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/usr/local/lib/python3.13/dist-packages/app/lib/graph/endpoint.py", line 106, in dispatch
    return await self.dispatch(data, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/app/lib/util_graph.py", line 118, in dispatch
    return await super().dispatch(data, context)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/hiku/endpoint/graphql.py", line 170, in dispatch
    return await super(AsyncGraphQLEndpoint, self).dispatch(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        data, context
        ^^^^^^^^^^^^^
    )
    ^
  File "/usr/local/lib/python3.13/dist-packages/hiku/endpoint/graphql.py", line 101, in dispatch
    result = await self.schema.execute(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^
    ...<4 lines>...
    )
    ^
  File "/usr/local/lib/python3.13/dist-packages/hiku/schema.py", line 209, in execute
    result = await self.engine.execute(execution_context)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/hiku/executors/asyncio.py", line 56, in process
    queue.progress(done)
    ~~~~~~~~~~~~~~^^^^^^
  File "/usr/local/lib/python3.13/dist-packages/hiku/executors/queue.py", line 117, in progress
    callback()
    ~~~~~~~~^^
  File "/usr/local/lib/python3.13/dist-packages/hiku/engine.py", line 853, in callback
    proc(),
    ~~~~^^
  File "/usr/local/lib/python3.13/dist-packages/hiku/telemetry/prometheus.py", line 183, in proc_wrapper
    result = result_proc()
  File "/usr/local/lib/python3.13/dist-packages/hiku/sources/graph.py", line 60, in result_proc
    proc(this, sq_result, *opt_args)
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<expr>", line 1, in <lambda>
  File "/usr/local/lib/python3.13/dist-packages/app/lib/graph/construct.py", line 232, in get_enum_key
    return enum_value.get_key()
           ^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'get_key'