tweak/fix system attribute handling
tweak/fix system attribute handling

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