Check for empty events before proceeding with the syncing (#531).

src/application/controllers/Google.php

@@ -221,8 +221,11 @@ class Google extends CI_Controller {
             foreach ($events->getItems() as $event)
             {
                 $results = $this->appointments_model->get_batch(['id_google_calendar' => $event->getId()]);
-                if (count($results) == 0)
-                {
+
+                if (!empty($results) || empty($event)) {
+                    continue;
+                }
+
                 // Record doesn't exist in E!A, so add the event now.
                 $appointment = [
                     'start_datetime' => date('Y-m-d H:i:s', strtotime($event->start->getDateTime())),
@@ -238,7 +241,6 @@ class Google extends CI_Controller {
 
                 $this->appointments_model->add($appointment);
             }
-            }
 
             $this->output
                 ->set_content_type('application/json')