UnicodeEncodeError on startup

[Andreas Poisel]

 * Calibre Version 0.8.11 (0.8.10 works fine)
 * OS: Kubuntu 11.04 (KDE Version 4.6.5)
 * Filesystem encoding: ISO-8859-1
 * Locale used: de_AT.iso88591

Traceback on startup (splash screen is displayed):

8<---------------------------------------------------------------------------

% /opt/calibre/calibre
Traceback (most recent call last):
  File "site-packages/calibre/gui2/ui.py", line 151, in load_store_plugins
  File "site-packages/calibre/gui2/ui.py", line 162, in init_istore
  File "site-packages/calibre/customize/__init__.py", line 634, in load_actual_plugin
  File "site-packages/calibre/gui2/store/__init__.py", line 56, in __init__
  File "site-packages/calibre/utils/config.py", line 241, in __init__
  File "site-packages/calibre/utils/config.py", line 251, in refresh
  File "genericpath.py", line 18, in exists
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 40-44: ordinal not in range(256)
Traceback (most recent call last):
  File "site-packages/calibre/gui2/main.py", line 260, in initialize
  File "site-packages/calibre/gui2/main.py", line 241, in initialize_db
  File "site-packages/calibre/gui2/main.py", line 210, in initialize_db_stage2
  File "site-packages/calibre/gui2/main.py", line 162, in start_gui
  File "site-packages/calibre/gui2/ui.py", line 128, in __init__
  File "site-packages/calibre/gui2/ui.py", line 151, in load_store_plugins
  File "site-packages/calibre/gui2/ui.py", line 162, in init_istore
  File "site-packages/calibre/customize/__init__.py", line 634, in load_actual_plugin
  File "site-packages/calibre/gui2/store/__init__.py", line 56, in __init__
  File "site-packages/calibre/utils/config.py", line 241, in __init__
  File "site-packages/calibre/utils/config.py", line 251, in refresh
  File "genericpath.py", line 18, in exists
UnicodeEncodeError: 'latin-1' codec can't encode characters in position 40-44: ordinal not in range(256)

8<---------------------------------------------------------------------------