Box Plot: Fix crash when attribute or group variable has no values #7112
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Issue
Fixes #7104.
The problem was not that there was no data: there was data, but the variable had no values (e.g. as in
values=()).Description of changes
Don't draw a graph when (categorical) variables have no values.
This is a nasty edge case that may also crash other widgets. It would be great if DBScan didn't produce such data.
Includes