ManyToManyRawIdWidget.render is assuming `attrs` is always passed as a dict.

[Germano Gabbianelli]

    def render(self, name, value, attrs=None):
        attrs['class'] = 'vManyToManyRawIdAdminField'
        if value:
            value = ','.join([force_unicode(v) for v in value])
        else:
            value = ''
        return super(ManyToManyRawIdWidget, self).render(name, value, attrs)

Either if I pass something else than a dict-like object or if I don't pass nothing at all, the method will raise an exception.

[David Novakovic]

I've added some tests to the original patch.

I've also adjusted a couple of indentation issues that seemed to be in the same area of tests :)

[Jannis Leidel]

(In [13971]) Fixed #14363 -- Fixed render method of ManyToManyRawIdWidget to set attrs to an empty dict. Thanks, tyrion and dpn.

[Jannis Leidel]

(In [13975]) [1.2.X] Fixed #14363 -- Fixed render method of ManyToManyRawIdWidget to set attrs to an empty dict. Thanks, tyrion and dpn.

Backport from trunk (r13971).