Added noop for set_customer_session_cookie.

Author: Andres A

includes/utils/class-ql-session-handler.php

@@ -416,4 +416,14 @@ public function reload_data() {
 \WC_Cache_Helper::invalidate_cache_group( WC_SESSION_CACHE_GROUP );
 $this->_data = $this->get_session( $this->_customer_id );
 }
+
+/**
+ * Noop for \WC_Session_Handler method.
+ *
+ * Prevents potential crticial errors when calling this method.
+ *
+ * @param bool $set Should the session cookie be set.
+ */
+public function set_customer_session_cookie($set) {}
+
 }