New Queue API destroys queue if sent with no static members

From FreePBX Pull request 22110, by xavifr , https://git.freepbx.org/projects/FREEPBX/repos/queues/pull-requests/48/diff

in the edge track for the queues module
 15.0.3.11 there is a new set of API calls for the queues module.

if you try to remove Static Members by sending members=.  the API call will shred your queue (and reset it to the default queue state - no name, no customized settings, nothing.)

if you remove dynamic members in the same way (`dynmember=`, it successfully clears the dynamic member list.

Specific tests that can trigger this
PUT to `[http://\|http:]SERVER/admin/api/api/rest/queues/members/999`
body: x-www-form-urlencoded
members: 123
dynmanber: 124
^^ will set both types of agent

members:
dynmember: 124
^^ will break your queue

member: 123
dynmember:
^ will clear dynamic members