Objects without prototype chain are broken

[martinhoefling]

When objects are created via Object.create(null) they cannot be expanded and the object properties are not shown due to Uncaught TypeError: obj.hasOwnProperty is not a function.
The problematic part is in https://github.com/chibicode/react-json-tree/blob/master/src/JSONObjectNode.js#L32 where it is assumed that hasOwnProperty is always present.

[skleeschulte]

Did you test your solution? I don't think it will work, because obj is not defined. The obj in the error message probably originates from the transpiled code. A solution could look like this:

if (Object.getPrototypeOf(data) === null || data.hasOwnProperty(key)) {

Unfortunately I cannot build the package myself, thus I cannot test changes and I don't want to make a PR.

[martinhoefling]

Yes, so I changed that line and got the expected behavior (in my case). Edit: actually - I did not copy the line but instead made an edit on github. You're right - obj is not defined. Your suggestion seems to be the proper fix I guess.

[martinhoefling]

I've pushed #23 and tested this. Works for me.

[chibicode]

Closed #23 thanks!