Avoid indexing out of bounds by returning if we don't have any dofs
Avoid indexing out of bounds by returning if we don't have any dofs

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