Getting NPE when passing null to validate method.

[rahul22048]

below is the code snippet:-

final JsonSchemaFactory factory = JsonSchemaFactory.byDefault();
final JsonNode node = JsonLoader.fromResource("/json-patch.json");
SCHEMA = factory.getJsonSchema(node);

in another method, i use it like this:-

ProcessingReport report = SCHEMA.validate(patchJson);

NPE exception comes when patchJson is passed as null.

for reference json-patch.json is same as the one here:- https://github.com/fge/json-schema-processor-examples/blob/master/src/main/resources/json-patch.json