Provide a better error message when bibtex file fails to parse
Provide a better error message when bibtex file fails to parse

(refs #6699)

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