multi: ensure NodeKey is set in rpc/cli

rpcserver.go

@@ -720,6 +720,11 @@ func (r *rpcServer) OpenChannel(in *lnrpc.OpenChannelRequest,
 
 	// TODO(roasbeef): also return channel ID?
 
+	// Ensure that the NodePubKey is set before attempting to use it
+	if len(in.NodePubkey) == 0 {
+		return fmt.Errorf("NodePubKey is not set")
+	}
+
 	// Parse the raw bytes of the node key into a pubkey object so we
 	// can easily manipulate it.
 	nodePubKey, err = btcec.ParsePubKey(in.NodePubkey, btcec.S256())

server.go

@@ -1773,7 +1773,7 @@ func (s *server) DisconnectPeer(pubKey *btcec.PublicKey) error {
 }
 
 // OpenChannel sends a request to the server to open a channel to the specified
-// peer identified by Public Key with the passed channel funding parameters.
+// peer identified by nodeKey with the passed channel funding parameters.
 //
 // NOTE: This function is safe for concurrent access.
 func (s *server) OpenChannel(nodeKey *btcec.PublicKey,