fix(broadcast): connections wont be made when not broadcastcall

Author: aleksander-vedvik

broadcast/errors.go

@@ -29,3 +29,11 @@ type ShardDownErr struct{}
 func (err ShardDownErr) Error() string {
 	return "the shard is down"
 }
+
+type InvalidAddrErr struct {
+	addr string
+}
+
+func (err InvalidAddrErr) Error() string {
+	return "provided addr is invalid. got: " + err.addr
+}

broadcast/router.go

@@ -102,6 +102,9 @@ func (r *BroadcastRouter) routeClientReply(broadcastID uint64, addr, method stri
 }
 
 func (r *BroadcastRouter) getClient(addr string) (*Client, error) {
+	if addr == "" {
+		return nil, InvalidAddrErr{addr: addr}
+	}
 	// fast path:
 	// read lock because it is likely that we will send many
 	// messages to the same client.