Fix south migration problem caused by 0003_update_keys_to_textversion using TextVersion model which is updated only in 0010_auto__add_field_textversion_category_1__add_field_textversion_category, same with 0007_populate_id_key_in_comments using Comment model updated in 0011_auto__add_field_comment_category.

def update(obj, kwargs):
    """
    Update obj attributes with values from kwargs
    """
    for k,v in kwargs.items():
        if hasattr(obj,k):
            setattr(obj,k,v)