Steps to reproduce:
Open an existing documentation which includes an exception. In Comment Editor click on the + after Exceptions to add a new empty row. Then click on the red cross in the new row to remove it.
Please confirm you want to remove the exception: ''?
This action cannot be undone.
Click on Yes. Nothing happens. The empty row is still visible.
I have to save and reopen the Comment Editor to get rid of the empty row.