Fix more tests

processor/processor.go

@@ -81,6 +81,8 @@ func ToLua(L *lua.LState, data interface{}) (lua.LValue, error) {
 		return lua.LBool(v), nil
 	case float64:
 		return lua.LNumber(v), nil
+	case nil:
+		return lua.LNil, nil
 	default:
 		return nil, fmt.Errorf("unsupported data type: %T", data)
 	}