Examples:
Filtering for unassigned tasks with:
assignees not in user1, user2, user3
gives an empty response.
Filtering for tasks not labelled “label1”
labels != label1
only shows tasks with a different label but not tasks with no label at all.
If this worked correctly it would be possible to search for unassigned tasks or to use labels like “inactive” or “deferred” and exclude them from views.
Showing values without a label or assignee should work when you check the “Show values without a value set” checkbox below the filter input.
We have plans to allow filtering for nulls explicitly, that should give you a little more control.
I just checked again on try:
With both saved filters “unassigned” and “empty label” I get an empty list. I leave these filters on try (don’t know when the box will be reset).
This seems kind of like a bug, but it will be fixed when we have the mentioned filtering for null values.
OK, so at least I posted it in the right category then. 