Fix Toast: same model than Notifications

Modules/Toast/ToastOverlay.qml

@@ -6,7 +6,14 @@ import qs.Commons
 import qs.Widgets
 
 Variants {
-  model: Quickshell.screens.filter(screen => (Settings.data.notifications.monitors.includes(screen.name) || (Settings.data.notifications.monitors.length === 0)))
+  model: {
+    const screens = Quickshell.screens.filter(screen => Settings.data.notifications.monitors.includes(screen.name));
+    // Empty list can mean two things :
+    // - No (visible) notification display activated in settings
+    // - One or more (not visible) displays are activated but unplugged
+    // In both cases we fallback to show notification on all screens
+    return screens.length === 0 ? Quickshell.screens : screens;
+  }
 
   delegate: ToastScreen {
     required property ShellScreen modelData