Previously, only PBS-type storages were queried when Active=0 because
querying inactive storage can return 500 errors. However, this caused
backups from datacenter backup tasks on shared storage (NFS, CIFS, etc.)
to not appear when the storage reported Active=0 on some nodes.
Now any storage with backup content is queried regardless of Active status.
If the storage is truly unavailable, GetStorageContent returns an error
which is already handled gracefully (logged and skipped).
Related to #1037
rcourtman
e4d7f6fd3d