fix: make errors in yamllint fatal and add extra check for empty lines

		return ""

	}

	if err != nil {

		t.Error(err)

		t.Fatalf("failed to render helm template: %s", err.Error())

		return ""

	}

	cmd := exec.Command("yamllint", "-")

	// yamllint with extra config

	// check indenting of sequences, but don't enforce a particular style, since current style is very inconsistent

	// disable trailing-space check, because sometimes we have empty variables and we don't want to use if blocks around every option

	cmd := exec.Command("yamllint", "-s", "-d", "{extends: default, rules: {indentation: {indent-sequences: whatever}, trailing-spaces: disable}}", "-")

	cmd.Stdin = strings.NewReader(output + "\n")

	var out strings.Builder

	cmd.Stdout = &out

	err = cmd.Run()

	if err != nil {

		t.Error(out.String())

		t.Fatalf("rendered template had yamllint errors: %s", out.String())

		return ""

	}

	// needed, because yamllint does not detect empty lines containing spaces

	require.NotRegexpf(t, regexp.MustCompile("\n[[:space:]]*\n"), output, "found empty lines in output")

	return output

}