Support empty constructors

Author: feildmaster

simpletoast.js

@@ -3,7 +3,7 @@
  */
 (() => {
   if (window !== window.top) return;
-  const version = buildVersion(1, 7, 3);
+  const version = buildVersion(1, 8, 0);
   if (window.SimpleToast) {
     if (SimpleToast.version) {
       if (SimpleToast.version >= version.number) return;
@@ -128,7 +128,7 @@
     exists: () => false,
     close: noop,
   };
-  function Toast({title, text, className, css = {}, buttons, timeout, onClose}) {
+  function Toast({title, text, className, css = {}, buttons, timeout, onClose} = {}) {
     if (typeof arguments[0] === 'string') {
       text = arguments[0];
     }