6540584 zfs list command should not produce "no datasets available" message in script mode

[nore...@opensolaris.org]

Author: mmusante
Repository: /hg/onnv/onnv-gate
Latest revision: 50b4bab9766b22a927c8cda576571a1d4111c38b
Total changesets: 1
Log message:
6540584 zfs list command should not produce "no datasets available" message in 
script mode

Files:
        update: usr/src/cmd/zfs/zfs_main.c
        update: usr/src/cmd/zpool/zpool_main.c