test-fix: missing metaschema causes exception to be thrown

include/jvalidate/adapters/jsoncpp.h

@@ -15,7 +15,7 @@ template <> inline bool load_stream(std::istream & in, Json::Value & out) {
   Json::CharReaderBuilder builder;
   std::string error;
   bool good = Json::parseFromStream(builder, in, &out, &error);
-  EXPECT_M(good, "Failed to load JSON: " << error);
+  // EXPECT_M(good, "Failed to load JSON: " << error);
   return good;
 }