[FIX] KMeans: Fix crashes when underlying algorithm fails #1974
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Issue
If k-means crashed, so does the widget.
Description of changes
The widget now catches exceptions. If k-means fails only for some k's, it still shows the table but disables the corresponding rows. If all fail (or optimization is disabled), it reports an error.
While fixing the table, I also changed the scaling for silhouette, so the the bars are not normalized according to minimal and maximal observed score but between 0 and 1.
Includes