Attribute error when importing admin.mixins if there is no TINYMCE_JS_* setting

[Greg Turner]

Patch in https://bitbucket.org/cogat/django-generic/commits/d05f78f093ecc6cc089c95c0eb6e4db48fabfb65

I don't know how to make a pull request from just one commit, and you may not want the edit controls in your other pull request.

[Simon Meers]

Fixed in 461ae09