Handle exception if db unavailable, refs #4851
Handle exception if db unavailable, refs #4851

Surfrdan/atom,artefactual/binder,Surfrdan/atom,Surfrdan/atom,CENDARI/atom,artefactual/atom,artefactual/binder,CENDARI/atom,artefactual/atom,artefactual/binder,kyfr59/atom-cg35,artefactual/atom,kyfr59/atom-cg35,CENDARI/atom,kyfr59/atom-cg35,artefactual/binder