If Parent Stream added automatically Schema is empty

Not sure which version of the SDK started this, but the last released SDK version on pypi I just hit this while doing some testing. (We need to add some tests for this one, as it's a nasty regression I think?)

1. Setup meltano.yml to select only a child stream (that has a parent stream)
2. You'll notice the schema is {"type": "SCHEMA", "stream": "team", "schema": {"properties": {}, "type": "object"}, "key_properties": ["id"]} for the parent stream. In this example I chose a child stream of team.* from tap-clickup

Hope this is enough to get a repro