David Roberts 226df35d96 [ML] Improve message misformation error in file structure finder (#42175)
This change replaces the extremely unfriendly message
"Number of messages analyzed must be positive" in the
case where the sample lines were incorrectly grouped
into just one message to an error that more helpfully
explains the likely root cause of the problem.
2019-05-16 18:29:38 +01:00
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