[FIX] owpreprocess: Handle columns with only NaN values #2064
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Issue
ZeroDivisonError - Weights sum to zero, can't be normalized
In case when all rows in a column are NaN then it throws that error.
https://sentry.io/biolab/orange3/issues/227119466/
Description of changes
Add another except in try block and now it shows an error message in the widget.
Includes