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Calling input.blur() fails if input was focused

See original GitHub issue

Basic info:

Node.js version: 11.6.0
jsdom version: 13.2.0

Minimal reproduction case

const { JSDOM } = require("jsdom");

const { window } = new JSDOM();
const { document } = window;

const input = document.createElement('input');
input.focus();
input.blur();

This results in a “Cannot read property ‘_defaultView’ of undefined” error:

[project]/node_modules/jsdom/lib/jsdom/living/helpers/focusing.js:71
    view: target._ownerDocument._defaultView,
                                ^

TypeError: Cannot read property '_defaultView' of undefined
    at Object.exports.fireFocusEventWithTargetAdjustment ([project]/node_modules/jsdom/lib/jsdom/living/helpers/focusing.js:71:33)
    at HTMLInputElementImpl.blur ([project]/node_modules/jsdom/lib/jsdom/living/nodes/HTMLAndSVGElementShared-impl.js:52:14)
    at HTMLInputElement.blur ([project]/node_modules/jsdom/lib/jsdom/living/generated/HTMLElement.js:38:23)
    at Object.<anonymous> ([project]/index.js:8:7)
    at Module._compile (internal/modules/cjs/loader.js:721:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:732:10)
    at Module.load (internal/modules/cjs/loader.js:620:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:560:12)
    at Function.Module._load (internal/modules/cjs/loader.js:552:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:774:12)