Warn if filter-samples returns empty table

When performing feature-table filter-samples, I often am unaware that the resulting table is empty because of some mistakes in the --p-where clause until I export or summarize the filtered table. It would be great if a warning is issued for an empty table. Thanks a lot.

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thanks @jjmmii!

I’ve opened an issue here. We will post back here whenever there is progress. :radio:

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