Small change in RBConstruction
Small change in RBConstruction

We only need to check if sigma(0) is zero, since if other singular values are
zero that just means that the matrix is of low rank, and that is handled naturally
but the rel_err check.

jwpeterson/libmesh,libMesh/libmesh,BalticPinguin/libmesh,dschwen/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,libMesh/libmesh,libMesh/libmesh,libMesh/libmesh,jwpeterson/libmesh,dschwen/libmesh,capitalaslash/libmesh,libMesh/libmesh,jwpeterson/libmesh,roystgnr/libmesh,dschwen/libmesh,BalticPinguin/libmesh,libMesh/libmesh,roystgnr/libmesh,capitalaslash/libmesh,dschwen/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,jwpeterson/libmesh,roystgnr/libmesh,BalticPinguin/libmesh,roystgnr/libmesh,capitalaslash/libmesh,dschwen/libmesh,dschwen/libmesh,dschwen/libmesh,BalticPinguin/libmesh,capitalaslash/libmesh,jwpeterson/libmesh,roystgnr/libmesh,capitalaslash/libmesh,roystgnr/libmesh,capitalaslash/libmesh,libMesh/libmesh,roystgnr/libmesh,jwpeterson/libmesh,BalticPinguin/libmesh,BalticPinguin/libmesh,libMesh/libmesh,roystgnr/libmesh,dschwen/libmesh,capitalaslash/libmesh,capitalaslash/libmesh