NULL to nullptr in SystemBase
NULL to nullptr in SystemBase

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