git-branch-list(is_a_branch): Quiet `git rev-parse`

We only care about the return code here. If `git rev-parse --verify` is
successful or if it fails to find a branch with the given name, it will
write output. We don't want this output to be printed, so send it to
`/dev/null`.

1 files changed, 1 insertions, 1 deletions

diff --git a/git-branch-list b/git-branch-list
index 5d0bc44..26098e4 100755
--- a/git-branch-list
+++ b/git-branch-list
@@ -73,7 +73,7 @@ function branch_or_current_branch () {
 function is_a_branch () {
 	local branch="$1"
 
-	git rev-parse --verify "$branch"
+	git rev-parse --verify "$branch" > /dev/null 2>&1
 	return $?
 }