[Feature request] Group for ungrouped entries

[px85]

Some records in database does not belong to any group ("group" field is null)
But I cant select those records specifically because group is empty.
Would it be possible to add select option like *Ungrouped* or *Empty* to be able to select those record that does not have a group?
But then *Ungrouped* or *Empty* should not be allowed to be a name for group.

[admin]

Thank you for the suggestion.
I will think about...