Improving error message
Improving error message

closes #10486

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