[lightsoff/arnaudb/wip/gtk4: 22/28] Fix another bug.

[Arnaud B. <arnaudb src gnome org>]

commit 548ba66f9ee1426116d6e65b86683b5f87dbf5f5
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Sat Nov 28 13:21:05 2020 +0100

    Fix another bug.

 src/lightsoff-window.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/lightsoff-window.vala b/src/lightsoff-window.vala
index 7794164..1441d04 100644
--- a/src/lightsoff-window.vala
+++ b/src/lightsoff-window.vala
@@ -189,7 +189,7 @@ private class LightsoffWindow : ManagedWindow
         else
         {
             game_button_1.hide ();
-            set_title (null);
+            set_title ("");
             revealer.set_reveal_child (true);
             notifications_revealer.set_window_size (/* thin */ true);
         }