bugfix:modify string in its iteration

apollo-portal/src/main/resources/static/scripts/directive/item-modal-directive.js

@@ -144,8 +144,8 @@ function itemModalDirective(toastr, $sce, AppUtil, EventManager, ConfigService)
 
                 var hiddenCharCounter = 0, valueWithHiddenChars = value;
 
-                for (var i = 0; i < valueWithHiddenChars.length; i++) {
-                    var c = valueWithHiddenChars[i];
+                for (var i = 0; i < value.length; i++) {
+                    var c = value[i];
                     if (isHiddenChar(c)) {
                         valueWithHiddenChars = valueWithHiddenChars.replace(c, viewHiddenChar);
                         hiddenCharCounter++;