Merge branch 'sb/submodule-diff-header-fix'

Error message tweak.

* sb/submodule-diff-header-fix:
  submodule: correct error message for missing commits

submodule.c

@@ -503,7 +503,7 @@ static void show_submodule_header(struct diff_options *o, const char *path,
 
 	if (add_submodule_odb(path)) {
 		if (!message)
-			message = "(not initialized)";
+			message = "(commits not present)";
 		goto output_header;
 	}
 

t/t4059-diff-submodule-not-initialized.sh

@@ -95,7 +95,7 @@ test_expect_success 'submodule not initialized in new clone' '
 	git clone . sm3 &&
 	git -C sm3 diff-tree -p --no-commit-id --submodule=log HEAD >actual &&
 	cat >expected <<-EOF &&
-	Submodule sm1 $smhead1...$smhead2 (not initialized)
+	Submodule sm1 $smhead1...$smhead2 (commits not present)
 	EOF
 	test_cmp expected actual
 '