[fix] #1062 Tests were broken

app/modules/crawler/lib/crawler.ts

@@ -64,6 +64,11 @@ export class Crawler extends stream.Transform implements DuniterService {
       this.sandboxCrawler.stopService()
     ])
   }
+
+  // Unused
+  _write(str:string, enc:any, done:any) {
+    done && done();
+  };
 }
 
 export class PeerCrawler implements DuniterService {