Protect invalid empty vector access (#901)
Protect invalid empty vector access (#901)

capitalaslash/libmesh,dschwen/libmesh,svallaghe/libmesh,dschwen/libmesh,benkirk/libmesh,capitalaslash/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,friedmud/libmesh,capitalaslash/libmesh,hrittich/libmesh,svallaghe/libmesh,coreymbryant/libmesh,pbauman/libmesh,capitalaslash/libmesh,coreymbryant/libmesh,90jrong/libmesh,aeslaughter/libmesh,BalticPinguin/libmesh,coreymbryant/libmesh,coreymbryant/libmesh,balborian/libmesh,libMesh/libmesh,giorgiobornia/libmesh,pbauman/libmesh,pbauman/libmesh,roystgnr/libmesh,dschwen/libmesh,aeslaughter/libmesh,hrittich/libmesh,roystgnr/libmesh,roystgnr/libmesh,90jrong/libmesh,roystgnr/libmesh,pbauman/libmesh,coreymbryant/libmesh,90jrong/libmesh,benkirk/libmesh,capitalaslash/libmesh,roystgnr/libmesh,giorgiobornia/libmesh,libMesh/libmesh,balborian/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,dschwen/libmesh,hrittich/libmesh,90jrong/libmesh,aeslaughter/libmesh,libMesh/libmesh,coreymbryant/libmesh,jwpeterson/libmesh,dschwen/libmesh,coreymbryant/libmesh,jwpeterson/libmesh,libMesh/libmesh,giorgiobornia/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,friedmud/libmesh,BalticPinguin/libmesh,friedmud/libmesh,friedmud/libmesh,jwpeterson/libmesh,balborian/libmesh,aeslaughter/libmesh,benkirk/libmesh,90jrong/libmesh,jwpeterson/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,libMesh/libmesh,friedmud/libmesh,hrittich/libmesh,90jrong/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,vikramvgarg/libmesh,balborian/libmesh,svallaghe/libmesh,90jrong/libmesh,vikramvgarg/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,roystgnr/libmesh,dschwen/libmesh,giorgiobornia/libmesh,aeslaughter/libmesh,friedmud/libmesh,aeslaughter/libmesh,hrittich/libmesh,svallaghe/libmesh,jwpeterson/libmesh,dschwen/libmesh,aeslaughter/libmesh,libMesh/libmesh,balborian/libmesh,libMesh/libmesh,90jrong/libmesh,roystgnr/libmesh,benkirk/libmesh,balborian/libmesh,aeslaughter/libmesh,jwpeterson/libmesh,90jrong/libmesh,balborian/libmesh,vikramvgarg/libmesh,pbauman/libmesh,aeslaughter/libmesh,roystgnr/libmesh,jwpeterson/libmesh,hrittich/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,hrittich/libmesh,svallaghe/libmesh,balborian/libmesh,hrittich/libmesh,benkirk/libmesh,benkirk/libmesh,giorgiobornia/libmesh,friedmud/libmesh,svallaghe/libmesh,vikramvgarg/libmesh,svallaghe/libmesh,balborian/libmesh,friedmud/libmesh,pbauman/libmesh,benkirk/libmesh,pbauman/libmesh,pbauman/libmesh,benkirk/libmesh,capitalaslash/libmesh,dschwen/libmesh,capitalaslash/libmesh,friedmud/libmesh,balborian/libmesh,pbauman/libmesh,libMesh/libmesh,hrittich/libmesh,BalticPinguin/libmesh,coreymbryant/libmesh,vikramvgarg/libmesh,giorgiobornia/libmesh,benkirk/libmesh