[PATCH] stash: Fix multiple error messages on create if no HEAD

create_stash() checks whether HEAD is valid via rev-parse. If this is
not the case, both itself as well as rev-parse print an error message.
Make rev-parse quiet.

In no_changes(), diff-index is called, which dies unquietly if there is
no commit. Hide it's stderr.

Signed-off-by: Sebastian Morr <redacted>
---

This bugged me: In a new, empty repository:

    $ git stash
    fatal: bad revision 'HEAD'
    fatal: bad revision 'HEAD'
    fatal: Needed a single revision
    You do not have the initial commit yet

With this patch:

    $ git stash
    You do not have the initial commit yet

With the --quiet option, I wouldn't expect diff-index to print error
messages. But it does so (via revision.c, setup_revisions()). Is this
wanted?

 git-stash.sh |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/git-stash.sh b/git-stash.sh
index c766692..07b6511 100755
--- a/git-stash.sh
+++ b/git-stash.sh

@@ -34,7 +34,7 @@ else
 fi
 
 no_changes () {
-	git diff-index --quiet --cached HEAD --ignore-submodules -- &&
+	git diff-index --quiet --cached HEAD --ignore-submodules -- 2>/dev/null &&
 	git diff-files --quiet --ignore-submodules &&
 	(test -z "$untracked" || test -z "$(untracked_files)")
 }

@@ -67,7 +67,7 @@ create_stash () {
 	fi
 
 	# state of the base commit
-	if b_commit=$(git rev-parse --verify HEAD)
+	if b_commit=$(git rev-parse --quiet --verify HEAD)
 	then
 		head=$(git rev-list --oneline -n 1 HEAD --)
 	else

-- 
1.7.8.168.gd6118.dirty