[gjs] jsUnit: Explicitly check if tempTop.parent is defined

[Iain Lane <iainl src gnome org>]

commit a6f229e5581a07285b8947535aa38d28216bccd3
Author: Iain Lane <iain orangesquash org uk>
Date:   Fri Mar 10 17:43:29 2017 +0000

    jsUnit: Explicitly check if tempTop.parent is defined
    
    This avoids 'reference to undefined property' warnings.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779871

 modules/jsUnit.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/jsUnit.js b/modules/jsUnit.js
index 93f5eef..6bff824 100644
--- a/modules/jsUnit.js
+++ b/modules/jsUnit.js
@@ -51,7 +51,7 @@ function jsUnitFixTop() {
   var tempTop = top;
   if (!tempTop) {
     tempTop = window;
-    while (tempTop.parent) {
+    while (typeof tempTop.parent !== 'undefined') {
       tempTop = tempTop.parent;
       if (tempTop.top && tempTop.top.jsUnitTestSuite) {
         tempTop = tempTop.top;