Find Duplicates : error first argument must be string
Bug description:
running on imac, latest os version and latest calibre version.
Got this error for quite some time in the find duplicates plugin
calibre, version 1.10.0
FOUT: Niet afgehandelde fout: <b>TypeError</b>:first argument must be string or compiled pattern
calibre 1.10 isfrozen: True is64bit: True
Darwin-13.0.0-x86_64-i386-64bit Darwin ('64bit', '')
('Darwin', '13.0.0', 'Darwin Kernel Version 13.0.0: Thu Sep 19 22:22:27 PDT 2013; root:xnu-2422.1.72~6/RELEASE_X86_64')
Python 2.7.5
OSX: ('10.9', ('', '', ''), 'x86_64')
Traceback (most recent call last):
File "calibre_plugins.find_duplicates.action", line 191, in toolbar_button_clicked
File "calibre_plugins.find_duplicates.action", line 152, in find_book_duplicates
File "calibre_plugins.find_duplicates.duplicates", line 124, in run_book_duplicates_check
File "calibre_plugins.find_duplicates.book_algorith ms", line 48, in run_duplicate_check
File "calibre_plugins.find_duplicates.book_algorith ms", line 81, in find_candidates
File "calibre_plugins.find_duplicates.book_algorith ms", line 340, in find_candidate
File "calibre_plugins.find_duplicates.matching", line 160, in similar_title_match
File "calibre_plugins.find_duplicates.matching", line 65, in fuzzy_it
File "lib/python2.7/re.py", line 190, in compile
File "lib/python2.7/re.py", line 238, in _compile
TypeError: first argument must be string or compiled pattern
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