Error in Polish when no cover present

[Better Red]

When I used Polish on a book that had an EPUB but didn't have a cover. I got following error.

======================
calibre, version 0.9.27 (win32, isfrozen: True)
Conversion Error: Failed: Polish Five Lessons for Economists on the Financial Crisis From Olivier Blanchard

Polish Five Lessons for Economists on the Financial Crisis From Olivier Blanchard
Python function terminated unexpectedly
  u'cover' (Error Code: 1)
Traceback (most recent call last):
  File "site.py", line 132, in main
  File "site.py", line 109, in run_entry_point
  File "site-packages\calibre\utils\ipc\worker.py", line 189, in main
  File "site-packages\calibre\ebooks\oeb\polish\main.py", line 178, in gui_polish
KeyError: u'cover'
======================

Update the cover in the book files was unchecked.

I created a cover with the Generate Cover plugin, I could then Polish the EPUB (to update the metadata), I then used Modify to remove the cover

BR

[Kovid Goyal (kovid)]

Fixed in next release.

 status fixreleased

[Better Red (urbanetiger)]

thanks m8