Enhance API error handling, add lastError tracking, and implement admin home template

api/template/get.php

@@ -10,7 +10,8 @@ $api = new gbAPI(false, $internal);
 
 // Get Template
 $template = $api->getSetting("template");
-
-$api->answer(200, [
-    "template_name" => $template
-]);
+if ($template !== NULL) {
+    $api->answer(200, [
+        "template_name" => $template
+    ]);
+}