Unable to use $ref #55
Description
Issue:
If I have a complex json which has a $ref like -
"$ref": "../common/my.json", then the library errors with the error =>TypeError: 'NoneType' object is not iterable
The element it is looking at is ".." of {"..", "common", "my.json"}.
Question: Should I be able to use a $ref to a another json file, either locally or based on $schema?