fix(sync): when called with --only-peers

When 'sync' is called with option '--only-peers', the path to function
'RemoteSynchronizer.getPeers()' is not the same as the default.

In this case we need to ensure that 'init()' was properly called and
proceed without a watcher.

app/modules/crawler/lib/sync/RemoteSynchronizer.ts

@@ -382,16 +382,23 @@ export class RemoteSynchronizer extends AbstractSynchronizer {
   }
 
   async syncPeers(fullSync: boolean, to?: number): Promise<void> {
+    if (!this.node) {
+      await this.init();
+    }
     const peers = await this.node.getPeers();
     for (let i = 0; i < peers.length; i++) {
       const peer = PeerDTO.fromJSONObject(peers[i]);
-      this.watcher.writeStatus("Peer " + peer.pubkey);
-      this.watcher.peersPercent(Math.ceil((i / peers.length) * 100));
+      if (this.watcher) {
+        this.watcher.writeStatus("Peer " + peer.pubkey);
+        this.watcher.peersPercent(Math.ceil((i / peers.length) * 100));
+      }
       try {
         await this.PeeringService.submitP(DBPeer.fromPeerDTO(peer));
       } catch (e) {}
     }
-    this.watcher.peersPercent(100);
+    if (this.watcher) {
+      this.watcher.peersPercent(100);
+    }
   }
 
   async syncSandbox(): Promise<void> {