Stack overflow error

[nahidakbar]

Test case

var djv = require("djv")

var env = djv();

env.addSchema('test', {
    "$schema": "http://json-schema.org/schema#",
    "title": "Aspect capturing a complete representation of a distribution according to Project Open Data (data.json).",
    "type": "object",
    "allOf": [
      {
        "$ref": "https://project-open-data.cio.gov/v1.1/schema/distribution.json"
      }
    ]
  })
  
env.validate('test#', {
    "@type": "dcat:Distribution",
    "downloadURL": "dataset-url/dataset.csv",
    "mediaType": "text/csv"
});

[korzio]

undefined:23
    }, f3 = function f0(data) {
                       ^

RangeError: Maximum call stack size exceeded
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:23:24)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:16:5)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:30:9)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:16:5)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:30:9)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:16:5)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:30:9)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:16:5)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:30:9)
    at f0 (eval at restore (/djv/lib/utils/template.js:124:15), <anonymous>:16:5)

[korzio]

@nahidakbar I've added 2 tests for the failing case

https://github.com/korzio/djv/blob/issues-71-exceed-maximum-call-stack/test/issues/71.js#L21

1. should throw reference error when schema is not found, should not exceed maximum call stack

Checks if the correct error is thrown when validator cannot find a schema. The validator is not responsive for downloadштп remote schema. User should add schema to the validator's environment himself. The error type is not final, can be changed during development.

2. should resolve local existing reference

Checks if an instance is validated correctly against the existing local schema

Please comment if you have any objections or additional thoughts, thanks!