[FIX] Google Analytics error

When Home component used in Login component, logEvent not passed.
Now Home component only logs events if logEvent is defined (i.e. it's not called from the Login component)

src/Home.js

@@ -19,7 +19,7 @@ export default function Home(props) {
 	document.title = "Parandum";
 
 	useEffect(() => {
-		props.logEvent("page_view");
+		if (props.logEvent) props.logEvent("page_view");
 	});
 
 	return (