Reports don't filter with empty custom fields
Hello,
I have created a group of custom fields and a new custom field type "Alphanumeric". Then I have created two contacts without assigning them any value in the custom field. Finally I have tried to filter the field in the reports as "is empty (NULL)" and the report shows only the null results. (When the contact is created it is assigned as empty)
Tested in multiple reports on dmaster: