Add 'if any' to log message on ‘unsupported JavaFX config’

The app shows a log message advising users to ignore the warning message
about the 'Unsupported JavaFX configuration' at the start.

However, this warning message might not appear under some circumstances.
In such cases, the advisory message can lead to confusion.

Let's add '(if any)' to the advisory log message, to reduce the risk
of such confusion.

src/main/java/seedu/address/Main.java

@@ -35,7 +35,7 @@ public static void main(String[] args) {
         // the user (if looking at the log output) that the said warning appearing in the log
         // can be ignored.
 
-        logger.warning("The warning about Unsupported JavaFX configuration below can be ignored.");
+        logger.warning("The warning about Unsupported JavaFX configuration below (if any) can be ignored.");
         Application.launch(MainApp.class, args);
     }
 }