Encoding problem

Created by: dbapl

 File "/home/taxiserver/taxienv/local/lib/python2.7/site-packages/sortable_listview/views.py", line 36, in get

  File "/home/taxiserver/taxienv/local/lib/python2.7/site-packages/sortable_listview/views.py", line 138, in get_sort_link_list

  File "/home/taxiserver/taxienv/local/lib/python2.7/site-packages/sortable_listview/views.py", line 149, in get_basic_sort_link

  File "/home/taxiserver/taxienv/local/lib/python2.7/site-packages/sortable_listview/views.py", line 69, in get_querystring
    def get_next_sort_string(self, field):

  File "/usr/lib/python2.7/urllib.py", line 1337, in urlencode
    l.append(k + '=' + quote_plus(str(elt)))

UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-1: ordinal not in range(128)

This shows up when we use version 0.30 and newer but not in 0.23. In query string we have also our parameters encoded which use Polish characters for example: "ąśćłó".