bin/python manage.py import_cendari -a 'X' -u 'Y' fails

[schildwaechter]

HTTP Error 404: Not Found
Traceback (most recent call last):
File "manage.py", line 10, in
execute_from_command_line(sys.argv)
File "/var/www/xmlfacets/local/lib/python2.7/site-packages/django/core/management/init.py", line 399, in execute_from_command_line
utility.execute()
File "/var/www/xmlfacets/local/lib/python2.7/site-packages/django/core/management/init.py", line 392, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/var/www/xmlfacets/local/lib/python2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv
self.execute(_args, *_options.dict)
File "/var/www/xmlfacets/local/lib/python2.7/site-packages/django/core/management/base.py", line 285, in execute
output = self.handle(_args, *_options)
File "/var/www/xmlfacets/local/lib/python2.7/site-packages/django/core/management/base.py", line 415, in handle
return self.handle_noargs(**options)
File "/var/www/xmlfacets/xmlfacets/main/management/commands/import_cendari.py", line 71, in handle_noargs
if 'data' not in data:
TypeError: argument of type 'NoneType' is not iterable