django-multiselectfield will do some comma-splitting when it loads a value from

the db, but if you set the value in the field to a string and immediately read

it back without committing to the db, it will return a string rather than a

list. In this case, webhooks that were created by a testcase running under

Django 1.8 (which dumps each test case into an atomic block) were failing

because the value read back was '*' instead of ['*'].

Ran unit tests on Django 1.6 and 1.8.