Minor sanity check to verify the string sent in isn't NULL when using
bit_unfmt.

Signed-off-by: Danny Auble <da@schedmd.com>
CRAY NATIVE - Fix issue on heavy systems to only run the NHC once per
job/step completion.
Remove unneeded step cleanup for pending steps.
Merge remote-tracking branch 'origin/slurm-14.03'

Conflicts:
	NEWS