widgets.SelectMultiple needs custom is_empty
|Reported by:||Owned by:||nobody|
|Severity:||Keywords:||selectmultiple, is_empty, manytomany|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
Noticed problems in newforms-admin with inline edits containing ManyToMany-fields never being considered as empty.
Adding  (empty list) to the values considered empty by the widget solves this.