Start with a valid configuration in Tools > Add-ons > TiddlyRemember.
Click "Add". Don't fill anything in.
Click OK.
The next sync will fail since it's trying to find a wiki with no path, and it's nearly impossible to see what's wrong in the interface
since the empty entry has no name and is consequently invisible in the list box.
Proposed fix:
Completely empty wiki entries should be silently discarded on exiting the dialog.
Empty wiki names should be forbidden.
The name of the wiki whose file doesn't exist should be displayed on the error message when syncing for further context. (In many different ways you could have entered an empty or malformed path, it may not be clear which entry is having the problem.)
Steps to reproduce:
The next sync will fail since it's trying to find a wiki with no path, and it's nearly impossible to see what's wrong in the interface since the empty entry has no name and is consequently invisible in the list box.
Proposed fix: