MDL-70139 core_badges: fix invalid request when sending to backpack

Having mixed $data in badge exporters is causing some issues.
As all these exporters are using $data as an object, $data can be
converted to object in the constructor, to avoid errors and get
the expected behaviour always.

badges/classes/external/assertion_exporter.php

@@ -39,6 +39,20 @@
  */
 class assertion_exporter extends exporter {
 
+    /**
+     * Constructor - saves the persistent object, and the related objects.
+     *
+     * @param mixed $data - Either an stdClass or an array of values.
+     * @param array $related - An optional list of pre-loaded objects related to this object.
+     */
+    public function __construct($data, $related = array()) {
+        // Having mixed $data is causing some issues. As this class is treating $data as an object everywhere, it can be converted
+        // to object at this point, to avoid errors and get the expected behaviour always.
+        // $data is an array when this class is a request exporter in backpack_api_mapping, but it is an object when this is
+        // used as a response exporter.
+        parent::__construct((object) $data, $related);
+    }
+
     /**
      * Map from a request response data to the internal structure.
      *

badges/classes/external/badgeclass_exporter.php

@@ -45,6 +45,12 @@ class badgeclass_exporter extends exporter {
      * @param array $related - An optional list of pre-loaded objects related to this object.
      */
     public function __construct($data, $related = array()) {
+        // Having mixed $data is causing some issues. As this class is treating $data as an object everywhere, it can be converted
+        // to object at this point, to avoid errors and get the expected behaviour always.
+        // $data is an array when this class is a request exporter in backpack_api_mapping, but it is an object when this is
+        // used as a response exporter.
+        $data = (object) $data;
+
         $pick = $this->pick_related();
         foreach ($pick as $one) {
             $isarray = false;