Don't try to touch non-existent files (submodule case)
Don't try to touch non-existent files (submodule case)

closes #10970

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