Code review comment for lp://qastaging/~diegosarmentero/ubuntuone-control-panel/tab-shares-functions

I get this backtrace:

Traceback (most recent call last):
  File "/home/ralsina/canonical/shares/ubuntuone/controlpanel/gui/qt/share_links_search.py", line 296, in run
    folders_data += self.get_folder_info(folder)
  File "/home/ralsina/canonical/shares/ubuntuone/controlpanel/gui/qt/share_links_search.py", line 316, in get_folder_info
    for root, _, files in os.walk(folder):
  File "/usr/lib/python2.7/os.py", line 294, in walk
    for x in walk(new_path, topdown, onerror, followlinks):
  File "/usr/lib/python2.7/os.py", line 284, in walk
    if isdir(join(top, name)):
  File "/usr/lib/python2.7/posixpath.py", line 71, in join
    path += '/' + b
UnicodeDecodeError: 'ascii' codec can't decode byte 0xf1 in position 17: ordinal not in range(128)