Update fixtures.ts

Author: FionnL

packages/sources/mobula-state/test/integration/fixtures.ts

@@ -149,10 +149,6 @@ export const mockWebsocketServer = (URL: string): MockWebsocketServer => {
 
   mockWsServer.on('connection', (socket) => {
     socket.on('message', (message) => {
-      // Skip if message is undefined (happens when subscribeMessage returns undefined)
-      if (!message) {
-        return
-      }
       const parsed = JSON.parse(message as string)
 
       // Handle Mobula v2 price subscriptions (asset_ids based)