'is_liquid' is not required parameter for single phase model
'is_liquid' is not required parameter for single phase model

Refs idaholab/relap-7#19688
dschwen/moose,harterj/moose,idaholab/moose,sapitts/moose,andrsd/moose,jessecarterMOOSE/moose,andrsd/moose,bwspenc/moose,milljm/moose,dschwen/moose,bwspenc/moose,laagesen/moose,laagesen/moose,milljm/moose,laagesen/moose,jessecarterMOOSE/moose,idaholab/moose,harterj/moose,sapitts/moose,andrsd/moose,sapitts/moose,lindsayad/moose,bwspenc/moose,andrsd/moose,harterj/moose,sapitts/moose,jessecarterMOOSE/moose,laagesen/moose,dschwen/moose,idaholab/moose,jessecarterMOOSE/moose,lindsayad/moose,idaholab/moose,harterj/moose,jessecarterMOOSE/moose,lindsayad/moose,milljm/moose,milljm/moose,bwspenc/moose,lindsayad/moose,laagesen/moose,lindsayad/moose,harterj/moose,sapitts/moose,dschwen/moose,dschwen/moose,milljm/moose,andrsd/moose,idaholab/moose,bwspenc/moose