Fix EAD physloc import when no sub-tags ref #5867
Fix EAD physloc import when no sub-tags ref #5867

Also added genreform sub-tag parsing, and
cleaned up code.

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