fix: add gRPC nil/zero check in query

codec/proto_codec.go

@@ -43,6 +43,10 @@ func NewProtoCodec(interfaceRegistry types.InterfaceRegistry) *ProtoCodec {
 // NOTE: this function must be used with a concrete type which
 // implements proto.Message. For interface please use the codec.MarshalInterface
 func (pc *ProtoCodec) Marshal(o ProtoMarshaler) ([]byte, error) {
+	// check nil messages early on to avoid panic.
+	if o.Size() == 0 {
+		return nil, nil
+	}
 	return o.Marshal()
 }