Change quickform custom addrule returns (#6332)

* refactor(quickFormCustom): change error type of applyfilter
Change fatal error to notice to comply with previous version error type all over the code.

* refactor(quickform): update quickform custom
stop execution if element not found

www/lib/HTML/QuickForm/HTML_QuickFormCustom.php

@@ -161,10 +161,12 @@ public function addRule($element, $message, $type, $format=null, $validation='se
         if (!$force) {
             if (!is_array($element) && !$this->elementExists($element)) {
                 trigger_error("Element '$element' does not exist");
+                return;
             } elseif (is_array($element)) {
                 foreach ($element as $el) {
                     if (!$this->elementExists($el)) {
                         trigger_error("Element '$el' does not exist");
+                        return;
                     }
                 }
             }