fix of TypeError: Cannot read property '0' of undefined

[tu1ly]

if array items are defined in schema and key is missing f.e.: schema: { "type":"object", "$schema": "http://json-schema.org/draft-03/schema", "id": "http://jsonschema.net", "required":false, "properties":{ "i": { "type":"array", "id": "http://jsonschema.net/i", "required":false, "items":[ { "type":"object", "id": "http://jsonschema.net/i/0", "required":false, "properties":{ "1": { "type":"number", "id": "http://jsonschema.net/i/0/1", "required":false } } }, { "type":"object", "id": "http://jsonschema.net/i/1", "required":false, "properties":{ "3": { "type":"number", "id": "http://jsonschema.net/i/1/3", "required":false } } } ] } } }

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data: { "i_key_is_missing": [] }