[PATCHv5 1/9] builtin/notes: Fix premature failure when trying to add the empty blob

This fixes a small buglet when trying to explicitly add the empty blob
as a note object using the -c or -C option to git notes add/append.
Instead of failing with a nonsensical error message indicating that the
empty blob does not exist, we should rather behave as if an empty notes
message was given (e.g. using -m "" or -F /dev/null).

The next patch contains a test that verifies the fixed behavior.

Found-by: Eric Sunshine [off-list ref]
Signed-off-by: Johan Herland <redacted>
---
 builtin/notes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/notes.c b/builtin/notes.c
index 68b6cd8..9ee6816 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c

@@ -266,7 +266,7 @@ static int parse_reuse_arg(const struct option *opt, const char *arg, int unset)
 
 	if (get_sha1(arg, object))
 		die(_("Failed to resolve '%s' as a valid ref."), arg);
-	if (!(buf = read_sha1_file(object, &type, &len)) || !len) {
+	if (!(buf = read_sha1_file(object, &type, &len))) {
 		free(buf);
 		die(_("Failed to read object '%s'."), arg);
 	}

-- 
2.0.0.rc4.501.gdaf83ca