Fixes failing tests on PHP 7.4

From PHP 7.4 docs:

    Calling get_object_vars() on an ArrayObject instance will now always return
    the properties of the ArrayObject itself (or a subclass). Previously it
    returned the values of the wrapped array/object unless the STD_PROP_LIST
    flag was specified. Other affected operations are:

     * ReflectionObject::getProperties()
     * reset(), current(), etc. Use Iterator methods instead.
     * Potentially others working on object properties as a list.

Author: michalbundyra

test/Helper/_files/modules/application/views/scripts/partialLoopChildObject.phtml

@@ -1,12 +1,12 @@
 <?php
 
-$vars = $this->vars();
+$vars = (array) $this->vars();
 
 if (empty($vars)) {
 	echo "No object model passed";
 } elseif (isset($vars['message'])) {
 	echo $vars['message'];
 } else {
-	$objKey = current($this->vars())->helper->getObjectKey();
+	$objKey = current($vars)->helper->getObjectKey();
 	echo 'This is an iteration with objectKey: ' . $objKey;
 }