[gnome-shell] lookingGlass: Handle undefined in objectToString()

[verdre <jonasd src gnome org>]

commit ff4623454f3929994ab3911c138f01cf02f723d5
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Feb 19 01:43:23 2020 +0100

    lookingGlass: Handle undefined in objectToString()
    
    Fallout from commit 9d941f8202: Template strings handle undefined
    values just fine, the replacement does not. Fix that.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/1020

 js/ui/lookingGlass.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/lookingGlass.js b/js/ui/lookingGlass.js
index d101591efa..54e3e48581 100644
--- a/js/ui/lookingGlass.js
+++ b/js/ui/lookingGlass.js
@@ -244,7 +244,7 @@ function objectToString(o) {
         // special case this since the default is way, way too verbose
         return '<js function>';
     } else {
-        return o.toString();
+        return o !== undefined ? o.toString() : 'undefined';
     }
 }