noUnknown() & nullable() broken in 0.28.4

[icflorescu]

This shouldn't fail, and it didn't prior to 0.28.4:

const schema = object({
  name: string()
}).nullable().noUnknown();

schema.validate(null) // this throws "Cannot convert undefined or null to object"

I'm guessing it has something to do with #579

To Reproduce

See error on 0.28.4: https://runkit.com/icflorescu/5ea1f46ebc48c6001a449316

Expected behavior

See it working correctly on 0.28.3: https://runkit.com/icflorescu/5ea1f8227abc65001a36be1f

Platform (please complete the following information):

• Version 0.28.4

[icflorescu]

It is related to #579.

yup/src/object.js

Line 243 in 16efe88

const unknownKeys = unknown(this.schema, value);

const unknownKeys = unknown(this.schema, value) shouldn't happen before testing for value == null

[icflorescu]

Do you want me to do a PR?

[jquense]

sure!

[icflorescu]

Can you please publish a new version on npm? Thanks a lot!

[Philipp91]

+1 for a release

[icflorescu]

Anything I can help with to speed up releasing the new version on npm?

[BenGale]

Any idea when this will be released?

[icflorescu]

It was released 12 days ago, AFAIK.

[icflorescu]

@BenGale Why, did you encounter the same problem? This should be gone for yup ^0.28.5...

[BenGale]

No sorry, all good now. I must have missed the release.