[Refactor] Results createStream: clean up _push handler

Author: ljharb

lib/results.js

@@ -113,7 +113,6 @@ Results.prototype.createStream = function (opts) {
 	if (opts.objectMode) {
 		output = through();
 		self.on('_push', function ontest(t, extra) {
-			if (!extra) { extra = {}; }
 			var id = testId++;
 			t.once('prerun', function () {
 				var row = {
@@ -123,7 +122,7 @@ Results.prototype.createStream = function (opts) {
 					skip: t._skip,
 					todo: t._todo
 				};
-				if (hasOwn(extra, 'parent')) {
+				if (extra && hasOwn(extra, 'parent')) {
 					row.parent = extra.parent;
 				}
 				output.queue(row);