Grouper: cannot read property '0' of undefined

[neSpecc]

Sometimes Grouper falls down due to following error

[neSpecc]

The problem: the PHP catcher sends some data via the incompatible format under invalid names and types. This issue was reported under codex-team/hawk.php#39

Such fields leads to the issues with diff calculation since fields could have different structure and types.

hawk.workers/lib/utils.js

Lines 50 to 58 in 2e18faf

	function arrayDiff(source, target) {
	const diffArray = [];
	for (let i = 0; i < target.length; i++) {
	diffArray[i] = deepDiff(source[i], target[i]);
	}
	return diffArray;
	}