Fix empty body get requests

Author: Meldiron

src/Executor/Runner/Docker.php

@@ -960,7 +960,11 @@ public function createExecution(
             \curl_setopt($ch, CURLOPT_URL, "http://" . $hostname . ":3000" . $path);
             \curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
             \curl_setopt($ch, CURLOPT_NOBODY, \strtoupper($method) === 'HEAD');
-            \curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
+            
+            if(!empty($payload)) {
+                \curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
+            }
+            
             \curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
             \curl_setopt($ch, CURLOPT_HEADERFUNCTION, function ($curl, $header) use (&$responseHeaders) {
                 $len = strlen($header);