Traceback in canonical_representation method

[rolandgeider]

Per mail from wger.de, seems some part of the dictionary was not filled correctly:

Traceback (most recent call last):
  File "/home/rge/www/venv-wger-production/lib/python3.4/site-packages/django/core/handlers/base.py", line 111, in get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/rge/www/wger-patched/wger/manager/views/workout.py", line 81, in view
    canonical = workout.canonical_representation
  File "/home/rge/www/wger-patched/wger/manager/models.py", line 122, in canonical_representation
    canonical_repr_day = day.get_canonical_representation()
  File "/home/rge/www/wger-patched/wger/manager/models.py", line 484, in get_canonical_representation
    set_obj)
ValueError: too many values to unpack (expected 2)