Benjamin Trent 3e014d39c2
[Transform] fail to start/put on missing pipeline (#50701) (#50795)
If a pipeline referenced by a transform does not exist, we should not allow the transform to be created. 

We do allow the pipeline existence check to be skipped with defer_validations, but if the pipeline still does not exist on `_start`, the pipeline will fail to start.

relates:  #50135
2020-01-09 10:33:22 -05:00
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