Add missing -z to git check-attr usage text for consistency with man page

diff --git a/attr.c b/attr.c
index aef93d896f7e72ec534c0c2c576e418bedc5cb30..b52efb55a036be10618d531d66697d7f7220c524 100644 (file)
--- a/attr.c
+++ b/attr.c
@@ -520,11 +520,13 @@ static void bootstrap_attr_stack(void)
                home_config_paths(NULL, &xdg_attributes_file, "attributes");
                git_attributes_file = xdg_attributes_file;
        }
-       elem = read_attr_from_file(git_attributes_file, 1);
-       if (elem) {
-               elem->origin = NULL;
-               elem->prev = attr_stack;
-               attr_stack = elem;
+       if (git_attributes_file) {
+               elem = read_attr_from_file(git_attributes_file, 1);
+               if (elem) {
+                       elem->origin = NULL;
+                       elem->prev = attr_stack;
+                       attr_stack = elem;
+               }
        }
 
        if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {