Make ParallelMesh::max_foo_id() more robust
Make ParallelMesh::max_foo_id() more robust

Previously these methods could fail in cases where (e.g. due to a
contraction with skip_renumbering on) the _elements or _nodes
containers ended with a null.

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