UnboundLocalError while creating icon theme

[Nicolas F.]

While creating an icon theme, the icons are processed normally but there is an error before the opening of the window to chose where to save the theme.
Sometimes I get the following message:

calibre, version 2.72.0
ERREUR : Exception non gérée: <b>UnboundLocalError</b>:local variable '_' referenced before assignment

calibre 2.72 [64bit] embedded-python: True is64bit: True
Windows-8-6.2.9200 Windows ('64bit', 'WindowsPE')
('Windows', '8', '6.2.9200')
Python 2.7.9
Windows: ('8', '6.2.9200', '', 'Multiprocessor Free')
Successfully initialized third party plugins: Kobo Utilities (2, 4, 1) && Count Pages (1, 6, 9) && KePub Output (2, 7, 1) && KePub Metadata Reader (2, 7, 1) && EpubMerge (2, 0, 14) && KePub Metadata Writer (2, 7, 1) && Extract ISBN (1, 4, 4) && Quality Check (1, 9, 11) && Goodreads Sync (1, 9, 0) && KoboTouchExtended (2, 8, 2) && Goodreads (1, 1, 11) && KePub Input (2, 7, 3)
Traceback (most recent call last):
  File "site-packages\calibre\gui2\preferences\misc.py", line 54, in create_icon_theme
  File "site-packages\calibre\gui2\icon_theme.py", line 419, in create_theme
  File "site-packages\calibre\gui2\win_file_dialogs.py", line 267, in choose_save_file
UnboundLocalError: local variable '_' referenced before assignment

And sometimes every images is processed, then the window close but the theme isn't saved (or at least I didn't find it)
I'm on calibre 2.72 on windows 10 64bits.

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every Friday.

 status fixreleased