fix: douyu allow empty (#2427)

lib/routes/douyu/room.js

@@ -23,6 +23,8 @@ module.exports = async (ctx) => {
                 link: `https://www.douyu.com/${id}`,
             },
         ];
+    } else {
+        ctx.state.allowEmpty = true;
     }
 
     ctx.state.data = {