fixed minor error when updating avi in settings

brain/controller/APIControl.inc.php

@@ -123,7 +123,13 @@ class APIControl
       case "settings":
         $token = $request->getHeader("fipamo-access-token");
         if (Session::verifyToken($token[0])) {
-          $result = SettingsAPI::handleSettingsTask($request, $args, $body);
+          if (isset($body)) {
+            $postBody = $body;
+          } else {
+            $postBody = null;
+          }
+
+          $result = SettingsAPI::handleSettingsTask($request, $args, $postBody);
         } else {
           $result = [
             "message" => "API access denied, homie",