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dagster

eg, have two solids feed into one solid, only one of the two runs, downstream solid conditionally receives input from one of them and runs

i think for this you could just use `Optional[Type]` as the input type and have the upstream solids return `None` instead of not omitting an `is_required=False` output

the conditional outputs stuff basically just exists for the skipping behavior

still getting `Dependencies for step esri.import_layer.compute failed: ['esri.extract_geojson.compute']. Not executing.`

```
@solid(
    input_defs=[
        InputDefinition(
            'geojson_result',
            Optional[Any]
        ),
        InputDefinition(
            'objects_result',
            Optional[Any]
        )
    ]
)```

the upstream solid has to explicitly return `None` instead of omitting it / not yielding it

if its already `Any` you might not need the `Optional` bit

yeah that's what i've got and still happening

Screen Shot 2020-03-24 at 4.39.37 PM.png

are you just doing `return None` or `yield Output(None)`?

also did you change the `OutputDefinition` to remove the optionality

huh weird, can you share the relevant slice of the event stream including the output events from the previous step