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dagster

Hi,  when I try to run my pipeline locally from Dagit, I get this error:
`AttributeError: 'ExecutionPlanSnapshotErrorData' object has no attribute 'execution_plan_snapshot'`
when I start it with `dagster pipeline execute -f  src/repositories.py --pipeline xx --preset xx` it works just fine.  Full stack trace in the thread.

```AttributeError: 'ExecutionPlanSnapshotErrorData' object has no attribute 'execution_plan_snapshot'
  File "/Users/peterszalai/.pyenv/versions/3.7.5/envs/dagster/lib/python3.7/site-packages/dagster_graphql/implementation/utils.py", line 14, in _fn
    return fn(*args, **kwargs)
  File "/Users/peterszalai/.pyenv/versions/3.7.5/envs/dagster/lib/python3.7/site-packages/dagster_graphql/implementation/execution/launch_execution.py", line 19, in launch_pipeline_execution
    return _launch_pipeline_execution(graphene_info, execution_params)
  File "/Users/peterszalai/.pyenv/versions/3.7.5/envs/dagster/lib/python3.7/site-packages/dagster_graphql/implementation/execution/launch_execution.py", line 49, in _launch_pipeline_execution
    run = do_launch(graphene_info, execution_params, is_reexecuted)
  File "/Users/peterszalai/.pyenv/versions/3.7.5/envs/dagster/lib/python3.7/site-packages/dagster_graphql/implementation/execution/launch_execution.py", line 37, in do_launch
    pipeline_run = create_valid_pipeline_run(graphene_info, external_pipeline, execution_params)
  File "/Users/peterszalai/.pyenv/versions/3.7.5/envs/dagster/lib/python3.7/site-packages/dagster_graphql/implementation/execution/run_lifecycle.py", line 26, in create_valid_pipeline_run
    execution_plan_snapshot=external_execution_plan.execution_plan_snapshot,```

Hi! Do you get any errors when running dagster pipeline launch instead? There should be an actual error there, it just isn't getting surfaced to you due to a bug that we fixed in 0.9.2

(same command should work, just with 'launch' instead of 'execute')

I'm on 0.9.1 actually, updating quickly :slightly_smiling_face:

Thank you very much, I could find the really issue.