Dimitris Athanasiou 0049e9467b
[7.x][ML] Fix node serialization on GET df-nalytics stats without id (#54808) (#54812)
Previously, the id of the `GetDataFrameAnalyticsStatsAction.Request`
could be `null` which caused NPE on serialization as `writeString`
is used (it doesn't accept null values).

This commit ensures the id is never null.

Closes #54807

Backport of #54808
2020-04-06 18:13:16 +03:00
..

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