processing dialog is defined properly to not to have close button

frontend-js/src/main/css/global.css

@@ -492,6 +492,10 @@ h1 {
 	margin: 5px;
 }
 
+.minerva-no-close .ui-dialog-titlebar-close {
+	display: none
+}
+
 .ui-icon {
 	display: inline-block;
 }

frontend-js/src/main/js/GuiConnector.js

@@ -132,10 +132,7 @@ GuiConnector.showProcessing = function(messageText) {
       title : "PROCESSING",
       width : "150px",
       closeOnEscape : false,
-      open : function(event, ui) {
-        /*jslint bitwise: true */
-        $(".ui-dialog-titlebar-close", ui.dialog | ui).hide();
-      },
+      dialogClass: 'minerva-no-close',
     });
   }
   if (messageText === undefined) {