IE11 bug nette.ajax.js 2.3.0 #159

420			if (formData.entries && navigator.userAgent.match(/version\/11(\.[0-9]*)? safari/i)) {
421				for (var pair of formData.entries()) {
422					if (pair[1] instanceof File && pair[1].name === '' && pair[1].size === 0) {
423						formData.delete(pair[0]);
424					}
425				}
426			}