doc: move git-get-tar-commit-id to plumbing

diff --git a/http-backend.c b/http-backend.c
index 88c38c834ba479447be8eb64f3bc5331cdb9ed49..458642ef72b879a2f53d6e1f8f192847ed814111 100644 (file)
--- a/http-backend.c
+++ b/http-backend.c
@@ -353,7 +353,7 @@ static ssize_t get_content_length(void)
        ssize_t val = -1;
        const char *str = getenv("CONTENT_LENGTH");
 
-       if (str && !git_parse_ssize_t(str, &val))
+       if (str && *str && !git_parse_ssize_t(str, &val))
                die("failed to parse CONTENT_LENGTH: %s", str);
        return val;
 }