Fix unused variables for assert tests
Fix unused variables for assert tests

Closes #11116

andrsd/moose,idaholab/moose,milljm/moose,SudiptaBiswas/moose,milljm/moose,sapitts/moose,permcody/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,andrsd/moose,nuclear-wizard/moose,nuclear-wizard/moose,laagesen/moose,idaholab/moose,idaholab/moose,jessecarterMOOSE/moose,sapitts/moose,andrsd/moose,dschwen/moose,YaqiWang/moose,andrsd/moose,permcody/moose,harterj/moose,laagesen/moose,harterj/moose,harterj/moose,harterj/moose,lindsayad/moose,lindsayad/moose,dschwen/moose,lindsayad/moose,lindsayad/moose,YaqiWang/moose,bwspenc/moose,dschwen/moose,bwspenc/moose,sapitts/moose,milljm/moose,sapitts/moose,laagesen/moose,jessecarterMOOSE/moose,sapitts/moose,YaqiWang/moose,SudiptaBiswas/moose,dschwen/moose,idaholab/moose,nuclear-wizard/moose,harterj/moose,laagesen/moose,bwspenc/moose,idaholab/moose,andrsd/moose,jessecarterMOOSE/moose,milljm/moose,dschwen/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,lindsayad/moose,milljm/moose,YaqiWang/moose,permcody/moose,permcody/moose,bwspenc/moose,nuclear-wizard/moose,laagesen/moose,SudiptaBiswas/moose,bwspenc/moose