Do not grab the reference to second derivatives if the variable does not have it
Do not grab the reference to second derivatives if the variable does not have it

r3994

markr622/moose,raghavaggarwal/moose,WilkAndy/moose,joshua-cogliati-inl/moose,danielru/moose,laagesen/moose,mellis13/moose,raghavaggarwal/moose,markr622/moose,cpritam/moose,apc-llc/moose,jhbradley/moose,roystgnr/moose,lindsayad/moose,jessecarterMOOSE/moose,yipenggao/moose,kasra83/moose,cpritam/moose,joshua-cogliati-inl/moose,cpritam/moose,liuwenf/moose,sapitts/moose,giopastor/moose,mellis13/moose,roystgnr/moose,kasra83/moose,giopastor/moose,friedmud/moose,permcody/moose,katyhuff/moose,stimpsonsg/moose,tonkmr/moose,WilkAndy/moose,YaqiWang/moose,stimpsonsg/moose,shanestafford/moose,jinmm1992/moose,jbair34/moose,jasondhales/moose,andrsd/moose,katyhuff/moose,zzyfisherman/moose,harterj/moose,dschwen/moose,waxmanr/moose,jhbradley/moose,bwspenc/moose,cpritam/moose,jiangwen84/moose,shanestafford/moose,adamLange/moose,permcody/moose,laagesen/moose,liuwenf/moose,waxmanr/moose,kasra83/moose,YaqiWang/moose,SudiptaBiswas/moose,jhbradley/moose,jessecarterMOOSE/moose,danielru/moose,wgapl/moose,yipenggao/moose,waxmanr/moose,idaholab/moose,roystgnr/moose,jiangwen84/moose,capitalaslash/moose,giopastor/moose,shanestafford/moose,laagesen/moose,jbair34/moose,yipenggao/moose,jasondhales/moose,capitalaslash/moose,laagesen/moose,markr622/moose,zzyfisherman/moose,jiangwen84/moose,backmari/moose,sapitts/moose,zzyfisherman/moose,permcody/moose,roystgnr/moose,jasondhales/moose,friedmud/moose,xy515258/moose,WilkAndy/moose,liuwenf/moose,jasondhales/moose,wgapl/moose,backmari/moose,idaholab/moose,cpritam/moose,tonkmr/moose,milljm/moose,idaholab/moose,jessecarterMOOSE/moose,tonkmr/moose,SudiptaBiswas/moose,xy515258/moose,dschwen/moose,adamLange/moose,katyhuff/moose,Chuban/moose,bwspenc/moose,katyhuff/moose,laagesen/moose,dschwen/moose,jessecarterMOOSE/moose,harterj/moose,lindsayad/moose,liuwenf/moose,adamLange/moose,SudiptaBiswas/moose,friedmud/moose,wgapl/moose,harterj/moose,andrsd/moose,mellis13/moose,sapitts/moose,milljm/moose,lindsayad/moose,WilkAndy/moose,jiangwen84/moose,apc-llc/moose,zzyfisherman/moose,jinmm1992/moose,harterj/moose,lindsayad/moose,nuclear-wizard/moose,jbair34/moose,milljm/moose,WilkAndy/moose,sapitts/moose,zzyfisherman/moose,liuwenf/moose,backmari/moose,shanestafford/moose,capitalaslash/moose,roystgnr/moose,bwspenc/moose,raghavaggarwal/moose,joshua-cogliati-inl/moose,backmari/moose,Chuban/moose,apc-llc/moose,nuclear-wizard/moose,YaqiWang/moose,YaqiWang/moose,lindsayad/moose,tonkmr/moose,tonkmr/moose,raghavaggarwal/moose,idaholab/moose,liuwenf/moose,jhbradley/moose,Chuban/moose,mellis13/moose,permcody/moose,jbair34/moose,yipenggao/moose,adamLange/moose,andrsd/moose,Chuban/moose,waxmanr/moose,SudiptaBiswas/moose,harterj/moose,jinmm1992/moose,danielru/moose,WilkAndy/moose,tonkmr/moose,milljm/moose,sapitts/moose,SudiptaBiswas/moose,jinmm1992/moose,wgapl/moose,bwspenc/moose,joshua-cogliati-inl/moose,nuclear-wizard/moose,zzyfisherman/moose,idaholab/moose,dschwen/moose,stimpsonsg/moose,capitalaslash/moose,roystgnr/moose,shanestafford/moose,stimpsonsg/moose,andrsd/moose,shanestafford/moose,andrsd/moose,nuclear-wizard/moose,jessecarterMOOSE/moose,markr622/moose,milljm/moose,xy515258/moose,apc-llc/moose,friedmud/moose,kasra83/moose,danielru/moose,bwspenc/moose,dschwen/moose,giopastor/moose,xy515258/moose,cpritam/moose,roystgnr/moose