When there are no notes in the marc record (and no content from outside sources) we should hide the descriptions tab (in opac and staff client). Otherwise you click and get a blank tab which is kind of annoying and just poor design.
Agreed, and the reason it doesn't do this right now is that content for the descriptions tab can come from different sources: the MARC record of course, but then also Amazon or Syndetics. Any fix for this bug will need to check all three.
This is still an issue/a desired enhancement.
Retested on current master - tab doesn't show when there is no information to show.