Fix 'cannot read property hide of null' error on quit (#1594)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/main/exit-app.ts

@@ -10,10 +10,10 @@ export function exitApp() {
   const clusterManager = ClusterManager.getInstance<ClusterManager>();
 
   appEventBus.emit({ name: "service", action: "close" });
-  windowManager.hide();
-  clusterManager.stop();
+  windowManager?.hide();
+  clusterManager?.stop();
   logger.info("SERVICE:QUIT");
   setTimeout(() => {
     app.exit();
   }, 1000);
-}
+}

src/main/window-manager.ts

@@ -163,8 +163,8 @@ export class WindowManager extends Singleton {
   }
 
   hide() {
-    if (!this.mainWindow?.isDestroyed()) this.mainWindow.hide();
-    if (!this.splashWindow.isDestroyed()) this.splashWindow.hide();
+    if (this.mainWindow && !this.mainWindow.isDestroyed()) this.mainWindow.hide();
+    if (this.splashWindow && !this.splashWindow.isDestroyed()) this.splashWindow.hide();
   }
 
   destroy() {