Use std::isnan (#8737)
Use std::isnan (#8737)

liuwenf/moose,idaholab/moose,nuclear-wizard/moose,nuclear-wizard/moose,nuclear-wizard/moose,permcody/moose,jessecarterMOOSE/moose,yipenggao/moose,friedmud/moose,Chuban/moose,harterj/moose,YaqiWang/moose,harterj/moose,SudiptaBiswas/moose,permcody/moose,nuclear-wizard/moose,YaqiWang/moose,andrsd/moose,backmari/moose,milljm/moose,sapitts/moose,dschwen/moose,lindsayad/moose,yipenggao/moose,idaholab/moose,andrsd/moose,jessecarterMOOSE/moose,harterj/moose,laagesen/moose,backmari/moose,SudiptaBiswas/moose,dschwen/moose,bwspenc/moose,Chuban/moose,idaholab/moose,bwspenc/moose,SudiptaBiswas/moose,andrsd/moose,yipenggao/moose,liuwenf/moose,SudiptaBiswas/moose,idaholab/moose,yipenggao/moose,liuwenf/moose,lindsayad/moose,liuwenf/moose,permcody/moose,andrsd/moose,backmari/moose,harterj/moose,sapitts/moose,bwspenc/moose,liuwenf/moose,friedmud/moose,bwspenc/moose,Chuban/moose,milljm/moose,backmari/moose,jessecarterMOOSE/moose,lindsayad/moose,andrsd/moose,SudiptaBiswas/moose,dschwen/moose,friedmud/moose,milljm/moose,harterj/moose,YaqiWang/moose,dschwen/moose,liuwenf/moose,jessecarterMOOSE/moose,milljm/moose,friedmud/moose,laagesen/moose,laagesen/moose,sapitts/moose,bwspenc/moose,lindsayad/moose,dschwen/moose,YaqiWang/moose,lindsayad/moose,permcody/moose,milljm/moose,idaholab/moose,sapitts/moose,Chuban/moose,laagesen/moose,laagesen/moose,jessecarterMOOSE/moose,sapitts/moose