Added version guards for solve results in PetscDiffSolver according to Roys suggestions
Added version guards for solve results in PetscDiffSolver according to Roys suggestions

roystgnr/libmesh,aeslaughter/libmesh,karpeev/libmesh,permcody/libmesh,dknez/libmesh,roystgnr/libmesh,benkirk/libmesh,BalticPinguin/libmesh,dknez/libmesh,jiangwen84/libmesh,90jrong/libmesh,vikramvgarg/libmesh,90jrong/libmesh,dschwen/libmesh,libMesh/libmesh,BalticPinguin/libmesh,svallaghe/libmesh,BalticPinguin/libmesh,aeslaughter/libmesh,giorgiobornia/libmesh,dmcdougall/libmesh,coreymbryant/libmesh,markcmiller86/libmesh_silo,pbauman/libmesh,permcody/libmesh,friedmud/libmesh,hrittich/libmesh,friedmud/libmesh,dschwen/libmesh,coreymbryant/libmesh,friedmud/libmesh,dmcdougall/libmesh,salazardetroya/libmesh,benkirk/libmesh,balborian/libmesh,jiangwen84/libmesh,salazardetroya/libmesh,BalticPinguin/libmesh,benkirk/libmesh,hrittich/libmesh,Mbewu/libmesh,90jrong/libmesh,salazardetroya/libmesh,vikramvgarg/libmesh,dmcdougall/libmesh,dschwen/libmesh,roystgnr/libmesh,dschwen/libmesh,giorgiobornia/libmesh,balborian/libmesh,90jrong/libmesh,jwpeterson/libmesh,90jrong/libmesh,roystgnr/libmesh,jwpeterson/libmesh,90jrong/libmesh,libMesh/libmesh,vikramvgarg/libmesh,balborian/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,libMesh/libmesh,90jrong/libmesh,permcody/libmesh,coreymbryant/libmesh,capitalaslash/libmesh,aeslaughter/libmesh,balborian/libmesh,hrittich/libmesh,Mbewu/libmesh,dknez/libmesh,aeslaughter/libmesh,karpeev/libmesh,svallaghe/libmesh,balborian/libmesh,karpeev/libmesh,aeslaughter/libmesh,svallaghe/libmesh,pbauman/libmesh,dschwen/libmesh,svallaghe/libmesh,jiangwen84/libmesh,benkirk/libmesh,BalticPinguin/libmesh,pbauman/libmesh,cahaynes/libmesh,jiangwen84/libmesh,cahaynes/libmesh,capitalaslash/libmesh,balborian/libmesh,balborian/libmesh,capitalaslash/libmesh,permcody/libmesh,roystgnr/libmesh,permcody/libmesh,dschwen/libmesh,capitalaslash/libmesh,capitalaslash/libmesh,markcmiller86/libmesh_silo,hrittich/libmesh,jwpeterson/libmesh,pbauman/libmesh,dknez/libmesh,permcody/libmesh,markcmiller86/libmesh_silo,coreymbryant/libmesh,giorgiobornia/libmesh,BalticPinguin/libmesh,dmcdougall/libmesh,salazardetroya/libmesh,pbauman/libmesh,cahaynes/libmesh,libMesh/libmesh,Mbewu/libmesh,dmcdougall/libmesh,dmcdougall/libmesh,capitalaslash/libmesh,vikramvgarg/libmesh,aeslaughter/libmesh,dknez/libmesh,karpeev/libmesh,hrittich/libmesh,dschwen/libmesh,giorgiobornia/libmesh,Mbewu/libmesh,Mbewu/libmesh,dknez/libmesh,markcmiller86/libmesh_silo,coreymbryant/libmesh,vikramvgarg/libmesh,markcmiller86/libmesh_silo,libMesh/libmesh,cahaynes/libmesh,pbauman/libmesh,pbauman/libmesh,salazardetroya/libmesh,capitalaslash/libmesh,hrittich/libmesh,90jrong/libmesh,balborian/libmesh,hrittich/libmesh,jiangwen84/libmesh,Mbewu/libmesh,roystgnr/libmesh,90jrong/libmesh,friedmud/libmesh,giorgiobornia/libmesh,Mbewu/libmesh,benkirk/libmesh,coreymbryant/libmesh,jwpeterson/libmesh,markcmiller86/libmesh_silo,markcmiller86/libmesh_silo,vikramvgarg/libmesh,karpeev/libmesh,jiangwen84/libmesh,friedmud/libmesh,svallaghe/libmesh,markcmiller86/libmesh_silo,roystgnr/libmesh,svallaghe/libmesh,permcody/libmesh,svallaghe/libmesh,aeslaughter/libmesh,permcody/libmesh,cahaynes/libmesh,friedmud/libmesh,jwpeterson/libmesh,giorgiobornia/libmesh,jwpeterson/libmesh,giorgiobornia/libmesh,balborian/libmesh,hrittich/libmesh,vikramvgarg/libmesh,svallaghe/libmesh,benkirk/libmesh,libMesh/libmesh,aeslaughter/libmesh,benkirk/libmesh,jiangwen84/libmesh,friedmud/libmesh,BalticPinguin/libmesh,jiangwen84/libmesh,dknez/libmesh,dschwen/libmesh,coreymbryant/libmesh,aeslaughter/libmesh,giorgiobornia/libmesh,benkirk/libmesh,cahaynes/libmesh,roystgnr/libmesh,libMesh/libmesh,karpeev/libmesh,coreymbryant/libmesh,karpeev/libmesh,BalticPinguin/libmesh,balborian/libmesh,svallaghe/libmesh,dmcdougall/libmesh,friedmud/libmesh,vikramvgarg/libmesh,karpeev/libmesh,cahaynes/libmesh,dknez/libmesh,giorgiobornia/libmesh,vikramvgarg/libmesh,salazardetroya/libmesh,benkirk/libmesh,hrittich/libmesh,Mbewu/libmesh,jwpeterson/libmesh,libMesh/libmesh,cahaynes/libmesh,salazardetroya/libmesh,pbauman/libmesh,friedmud/libmesh,salazardetroya/libmesh,Mbewu/libmesh,dmcdougall/libmesh,pbauman/libmesh