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[dagit] Don't block viewing PythonError on Playground preview

Authored by dish on Feb 11 2021, 7:52 PM.



When an error occurs in generating the run preview pane on the Dagit playground, we have a PythonError but aren't correctly clearing the loading overlay. Fix this by only showing the overlay when the preview is actually loading. I'm not sure if I introduced this bug recently, but hopefully I'm not overlooking anything here.

Also change the error link to be a proper ButtonLink.

Test Plan

Yield a SerializableErrorInfo from GrpcServerRepositoryLocation.get_subset_external_pipeline_result, open playground and select a solid. Verify that the error is clickable and not blocked by the loading overlay.

Diff Detail

R1 dagster
Lint Not Applicable
Tests Not Applicable