Ajout du validateur json + correctif factory metadata

lib/All/json-schema-validator/test/issue-98.cpp

@@ -0,0 +1,16 @@
+#include <nlohmann/json-schema.hpp>
+
+int main(void)
+{
+	nlohmann::json nlBase{{"$ref", "#/unknown/keywords"}};
+	nlohmann::json_schema::json_validator validator;
+
+	try {
+		validator.set_root_schema(nlBase); // this line will log the caught exception
+	} catch (const std::exception &e) {
+
+		if (std::string("after all files have been parsed, '<root>' has still the following undefined references: [/unknown/keywords]") == e.what())
+			return EXIT_SUCCESS;
+	}
+	return EXIT_FAILURE;
+}