Resolve "Handle the cases where an user of an execution is null"

Closes #143 (closed)

src/client/models/WorkflowExecutionOut.ts

@@ -23,7 +23,7 @@ export type WorkflowExecutionOut = {
     /**
      * UID of user who started the workflow
      */
-    executor_id: string;
+    executor_id?: (string | null);
     /**
      * Start time of the workflow execution as UNIX timestamp
      */