[BUGFIX] Only extend YAML file content if config is not empty

Relates #36

Author: schloram

src/ConfigDumper.php

@@ -49,7 +49,11 @@ public function dumpToFile(array $config, string $file, string $comment = ''): b
                     $fileContent .= Yaml::dump(['processors' => $config['processors']], 2) . chr(10);
                     unset($config['processors']);
                 }
-                $fileContent .= Yaml::dump($config, 6);
+            
+                if (!empty($config)) {
+                    $fileContent .= Yaml::dump($config, 6);
+                }
+            
                 break;
             case 'php':
             default: