Throw StorageNotAvailable if propfind on root failed
Throw StorageNotAvailable if propfind on root failed

If PROPFIND fails with 404 or 405 on the remote share root, it means the
storage is not available. Throw StorageNotAvailable is such case.

pollopolea/core,whitekiba/server,sharidas/core,phil-davis/core,andreas-p/nextcloud-server,pollopolea/core,owncloud/core,michaelletzgus/nextcloud-server,pmattern/server,bluelml/core,owncloud/core,pixelipo/server,andreas-p/nextcloud-server,cernbox/core,IljaN/core,pollopolea/core,sharidas/core,sharidas/core,jbicha/server,Ardinis/server,nextcloud/server,endsguy/server,owncloud/core,pmattern/server,whitekiba/server,Ardinis/server,andreas-p/nextcloud-server,bluelml/core,xx621998xx/server,endsguy/server,cernbox/core,michaelletzgus/nextcloud-server,xx621998xx/server,Ardinis/server,pixelipo/server,nextcloud/server,pixelipo/server,lrytz/core,xx621998xx/server,pmattern/server,cernbox/core,cernbox/core,Ardinis/server,michaelletzgus/nextcloud-server,owncloud/core,jbicha/server,cernbox/core,nextcloud/server,whitekiba/server,sharidas/core,lrytz/core,lrytz/core,endsguy/server,bluelml/core,pixelipo/server,andreas-p/nextcloud-server,owncloud/core,IljaN/core,pixelipo/server,pollopolea/core,andreas-p/nextcloud-server,IljaN/core,pmattern/server,bluelml/core,IljaN/core,bluelml/core,xx621998xx/server,whitekiba/server,endsguy/server,IljaN/core,lrytz/core,jbicha/server,pollopolea/core,nextcloud/server,jbicha/server,whitekiba/server,jbicha/server,endsguy/server,xx621998xx/server,lrytz/core,Ardinis/server,michaelletzgus/nextcloud-server,pmattern/server,sharidas/core