Correct the bug of not merging two permanent child nodes
Correct the bug of not merging two permanent child nodes

dschwen/moose,dschwen/moose,friedmud/moose,jessecarterMOOSE/moose,milljm/moose,katyhuff/moose,harterj/moose,YaqiWang/moose,milljm/moose,giopastor/moose,bwspenc/moose,joshua-cogliati-inl/moose,jessecarterMOOSE/moose,nuclear-wizard/moose,Chuban/moose,bwspenc/moose,bwspenc/moose,idaholab/moose,permcody/moose,milljm/moose,sapitts/moose,jasondhales/moose,jhbradley/moose,yipenggao/moose,joshua-cogliati-inl/moose,idaholab/moose,SudiptaBiswas/moose,jessecarterMOOSE/moose,sapitts/moose,idaholab/moose,katyhuff/moose,dschwen/moose,backmari/moose,backmari/moose,jasondhales/moose,friedmud/moose,giopastor/moose,jhbradley/moose,nuclear-wizard/moose,YaqiWang/moose,yipenggao/moose,jhbradley/moose,liuwenf/moose,nuclear-wizard/moose,stimpsonsg/moose,friedmud/moose,stimpsonsg/moose,stimpsonsg/moose,jasondhales/moose,Chuban/moose,dschwen/moose,SudiptaBiswas/moose,laagesen/moose,SudiptaBiswas/moose,bwspenc/moose,harterj/moose,YaqiWang/moose,lindsayad/moose,harterj/moose,Chuban/moose,lindsayad/moose,sapitts/moose,nuclear-wizard/moose,laagesen/moose,lindsayad/moose,liuwenf/moose,lindsayad/moose,harterj/moose,bwspenc/moose,giopastor/moose,sapitts/moose,SudiptaBiswas/moose,laagesen/moose,lindsayad/moose,liuwenf/moose,liuwenf/moose,yipenggao/moose,harterj/moose,permcody/moose,stimpsonsg/moose,dschwen/moose,friedmud/moose,milljm/moose,joshua-cogliati-inl/moose,jessecarterMOOSE/moose,laagesen/moose,YaqiWang/moose,milljm/moose,giopastor/moose,liuwenf/moose,andrsd/moose,Chuban/moose,katyhuff/moose,SudiptaBiswas/moose,andrsd/moose,katyhuff/moose,jasondhales/moose,sapitts/moose,andrsd/moose,idaholab/moose,laagesen/moose,jhbradley/moose,jessecarterMOOSE/moose,permcody/moose,idaholab/moose,permcody/moose,yipenggao/moose,backmari/moose,joshua-cogliati-inl/moose,liuwenf/moose,backmari/moose,andrsd/moose,andrsd/moose