cmd: Improve the message when the volume has no label.

[Akihiro Sagawa]

---
 programs/cmd/builtins.c |   12 ++++++++++--
 programs/cmd/cmd.rc     |    4 +++-
 programs/cmd/wcmd.h     |    4 +++-
 3 files changed, 16 insertions(+), 4 deletions(-)

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