Handle null errors in Action model instantiation

Previously, the `error` property could be undefined, leading to potential issues during object creation. This update ensures that `error` defaults to `null` if not provided, enhancing the robustness of the Action model instantiation process.

src/Models/Actions/Action.php

@@ -148,6 +148,6 @@ public static function parse($input)
             return;
         }
 
-        return new self($input->id, $input->command, $input->progress, $input->status, $input->started, $input->finished, $input->resources, $input->error);
+        return new self($input->id, $input->command, $input->progress, $input->status, $input->started, $input->finished, $input->resources, $input->error ?? null);
     }
 }