Belos::LinearProblem should unset itself if preconditioner is set
Created by: mhoemmen
@hkthorn @trilinos/belos
See discussion here: https://github.com/UK-MAC/TeaLeaf_Trilinos/issues/2
Created by: mhoemmen
@hkthorn @trilinos/belos
See discussion here: https://github.com/UK-MAC/TeaLeaf_Trilinos/issues/2