mtx: tweak the printouts for the status command
mtx: tweak the printouts for the status command

Print the volumetag for the media in the data transfer element if
there is a media loaded.

Don't print the volumetag for storage slots that are empty.

Signed-off-by: Ronnie Sahlberg <0d49b29a77bd79be0aba485e971a1f480cda9d08@gmail.com>

AHelper/python-scsi,AHelper/python-scsi,rosjat/python-scsi