[gnome-shell/wip/rstrode/rhel-7.9: 46/86] realmd: Set login format to null on start and update if invalid

[Ray Strode <halfline src gnome org>]

commit 0b23894f0a3f835472195d445f5dceb986306064
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Thu May 23 06:12:56 2019 +0200

    realmd: Set login format to null on start and update if invalid
    
    We were checking an undefined property but that would lead to a a warning.
    Instead we can consider the login format unset until is null, and in case
    update it.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/700

 js/gdm/realmd.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/js/gdm/realmd.js b/js/gdm/realmd.js
index 9aa27d9287..c3a35ea489 100644
--- a/js/gdm/realmd.js
+++ b/js/gdm/realmd.js
@@ -68,6 +68,7 @@ var Manager = new Lang.Class({
                                            '/org/freedesktop/realmd',
                                            this._reloadRealms.bind(this))
         this._realms = {};
+        this._loginFormat = null;
 
         this._signalId = this._aggregateProvider.connect('g-properties-changed',
             (proxy, properties) => {
@@ -133,7 +134,7 @@ var Manager = new Lang.Class({
     },
 
     get loginFormat() {
-        if (this._loginFormat !== undefined)
+        if (this._loginFormat)
             return this._loginFormat;
 
         this._updateLoginFormat();