git describe --contains

Hi all,

Doing:   git describe --contains SHA

on a SHA that is not contained by any tags gives a confusing error message that it cannot describe the SHA. Could this error message be changed please to just say something like "SHA1 is not in any tags."

The problem resides in builtin-describe.c:377. It uses cmd_name_rev from builtin- name-rev.c. I'm attempting to rewrite this, and have a describe_contains() - Hopefully, I'll get a patch out by the end of the day.