lnd: make closechannel send an instant empty update when no_wait set

We do things this way to keep behavior consistent across REST, gRPC
and CLI consistent. This was done to not alter the way we handle
Recv calls from the streams.

cmd/lncli/commands.go

@@ -921,6 +921,10 @@ func executeChannelClose(ctxc context.Context, client lnrpc.LightningClient,
 		}
 
 		switch update := resp.Update.(type) {
+		case *lnrpc.CloseStatusUpdate_CloseInstant:
+			if req.NoWait {
+				return nil
+			}
 		case *lnrpc.CloseStatusUpdate_ClosePending:
 			closingHash := update.ClosePending.Txid
 			txid, err := chainhash.NewHash(closingHash)