Omitting items from arrays causes it to throw.

[gtrindade]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.

Description

An array without the items field, breaks the rendered form.

I noticed some schemas I have were breaking stuff heavily in the app I'm working on. And I noticed sending invalid schemas usually results in a proper message like "the schema is invalid" or something, instead of rendering the form, but for some schemas it would just break catastrophically impacting in my whole page some times.

Upon further investigation I noticed some of my schemas had properties of type "array" with no "items" field. And I was surprised to see that in my database because I validate everything before saving. Turns out these are actually valid schemas:

"Omitting this keyword has the same behavior as an empty schema."
http://json-schema.org/latest/json-schema-validation.html#rfc.section.6.9

I debugged react-jsonschema-form's source code a little bit and saw that it was really throwing here:
https://github.com/mozilla-services/react-jsonschema-form/blob/9d79b71f13d87831e5c9e2d8fc7ae5e5ca7865c4/src/utils.js#L398
that is a call from here:
https://github.com/mozilla-services/react-jsonschema-form/blob/d403edc20a1d839326b8f6d0a380f84697efba2b/src/components/fields/ArrayField.js#L367
And this code tells me you guys are assuming all arrays should have the items property and not really checking if schema.items is defined, causing it to throw an uncatched exception.

Steps to Reproduce

1. Just run this fiddle https://jsfiddle.net/h6fsjLhj/

Expected behavior

I know it's probably not possible to render a form for this scenario, but the tool should ignore fields like this or probably provide feedback that this type of schema is not supported.

Actual behavior

The tool just throws, and since catching rendering exceptions in React is not always simple, it can cause unexpected behavior in the whole app.

Version

0.49.0

Thanks! And let me know if I can provide more info, or if there is a workaround I can use.

[llamamoray]

Hi, any idea when this will be released?

[glasserc]

Hi, I just released v0.50.0 which should contain a fix for this.

[gtrindade]

Thank you for the quick fix! 🎉