add null return to avoid having to check for undefined

ElectronNET.Host/api/browserWindows.js

@@ -619,6 +619,7 @@ module.exports = (socket, app) => {
                 return element;
             }
         }
+        return null;
     }
 };
 //# sourceMappingURL=browserWindows.js.map

ElectronNET.Host/api/browserWindows.ts

@@ -785,5 +785,6 @@ export = (socket: Socket, app: Electron.App) => {
                 return element;
             }
         }
+        return null;
     }
 };