fix(account middleware): 使用了未定义的变量。

config.yml.example

@@ -19,6 +19,6 @@ db:
   etcd:
     hosts:
       - 'http://192.168.31.194:2379'
-  
+
 workspaces:
   root: '/Users/ivanli/Projects/fennec/workspaces'

src/commons/middleware/account.middleware.ts

@@ -11,7 +11,7 @@ export class AccountMiddleware implements NestMiddleware {
   async use(req: any, res: any, next: () => void) {
     const authPayload = req.header('authorization') ?? '';
     if (!authPayload) {
-      req.user = req.session.user;
+      req.user = req.session?.user;
       next();
       return;
     }