Improve 'json-prune' — logging null

[AdamWr]

If there is something like JSON.parse(null); and we use #%#//scriptlet('json-prune'), then script throws error.

Steps to reproduce

1. Add this rule:

example.org#%#//scriptlet('json-prune')

2. Go to - https://example.org/
3. Run in browser console:

(() => {
  console.log('start');
  JSON.parse(null);
  console.log('end');
})();

Screenshot

Uncaught TypeError: Cannot convert undefined or null to object

If I'm not wrong, the problem is with isEmptyObject:

Scriptlets/src/helpers/object-utils.js

Line 38 in c33826b

export const isEmptyObject = (obj) => Object.keys(obj).length === 0 && !obj.prototype;

It throws error for null.

---

Related to - AdguardTeam/AdguardFilters#140217
Website is broken after adding rule like this:

crackle.com#%#//scriptlet('json-prune')

to user rules.