Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12969#issuecomment-218973390
It seems like a good change, because several lower-level methods now return
a reasonable result instead of an error. At a higher level, having 0 labels
probably still results in some (better) error, or a trivial model, but that has
at least improved the situation.
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