NOTE: I edited the bug report and move part of the content into a separated RFE: https://bugs.launchpad.net/neutron/+bug/1762752 . As a result, this RFE is about handling empty value ("") in filter.
NOTE: I edited the bug report and move part of the content into a separated RFE: https:/ /bugs.launchpad .net/neutron/ +bug/1762752 . As a result, this RFE is about handling empty value ("") in filter.