'None' value doesn't show up in related field filter
|Reported by:||Owned by:||nobody|
|Severity:||Keywords:||filter, filters, related|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
In the current django version related filters doesn't have "None" value, but have "All" value. This is unfair! ;)
None value should appear when null=True field attribute is set.