no dialogue pops up when picture dir is not created

When a user who doesnt have /home/<username>/Pictures tries to set a picture for a contact, nothing happens.
commandline output shows the following:

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dexter/NewcontactDialog.py", line 410, in photo_button_clicked
    chooser.set_current_folder(glib.get_user_special_dir(glib.USER_DIRECTORY_PICTURES))
TypeError: Gtk.FileChooser.set_current_folder() argument 1 must be string, not None
Error in sys.excepthook:
Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/apport_python_hook.py", line 105, in apport_excepthook
    os.O_WRONLY|os.O_CREAT|os.O_EXCL, 0600), 'w')
OSError: [Errno 2] File or Folder not found: '/var/crash/_usr_bin_dexter.1000.crash'

Original exception was:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/dexter/NewcontactDialog.py", line 410, in photo_button_clicked
    chooser.set_current_folder(glib.get_user_special_dir(glib.USER_DIRECTORY_PICTURES))
TypeError: Gtk.FileChooser.set_current_folder() argument 1 must be string, not None