Updating demo.html to resolve null ref issue and resolve bootstrap styling.

Author: TimFerrell

demo.html

@@ -201,7 +201,7 @@ <h2>Links</h2>
 
         var getMessageWithClearButton = function (msg) {
             msg = msg ? msg : 'Clear itself?';
-            msg += '<br /><br /><button type="btn button" class="clear">Yes</button>';
+            msg += '<br /><br /><button type="button" class="btn clear">Yes</button>';
             return msg;
         };
 
@@ -287,6 +287,11 @@ <h2>Links</h2>
 
             var $toast = toastr[shortCutFunction](msg, title); // Wire up an event handler to a button in the toast, if it exists
             $toastlast = $toast;
+
+            if(typeof $toast === 'undefined'){
+                return;
+            }
+
             if ($toast.find('#okBtn').length) {
                 $toast.delegate('#okBtn', 'click', function () {
                     alert('you clicked me. i was toast #' + toastIndex + '. goodbye!');