Guard against null or missing keys.

Signed-off-by: Lorenzo Moscati <[email protected]>

Author: Fly7113

php/src/Controller/DockerController.php

@@ -171,7 +171,7 @@ public function StartContainer(Request $request, Response $response, array $args
         $uri = $request->getUri();
         $host = $uri->getHost();
         $port = $uri->getPort();
-        $path = $request->getParsedBody()['base_path'];
+        $path = $request->getParsedBody()['base_path'] ?? '';
         if ($port === 8000) {
             error_log('The AIO_URL-port was discovered to be 8000 which is not expected. It is now set to 443.');
             $port = 443;