Fix NPE when chat messages are canceled

Author: JRoy

providers/PaperProvider/src/main/java/net/ess3/provider/providers/PaperChatListenerProvider.java

@@ -44,10 +44,10 @@ public void onHighest(final AsyncChatEvent event) {
         final PaperChatEvent paperChatEvent = wrap(event);
         onChatHighest(paperChatEvent);
 
-        final TextComponent format = serializer.deserialize(paperChatEvent.getFormat());
-        final TextComponent eventMessage = serializer.deserialize(paperChatEvent.getMessage());
-
         if (!event.isCancelled()) {
+            final TextComponent format = serializer.deserialize(paperChatEvent.getFormat());
+            final TextComponent eventMessage = serializer.deserialize(paperChatEvent.getMessage());
+
             event.renderer(ChatRenderer.viewerUnaware((player, displayName, message) ->
                     format.replaceText(builder -> builder
                             .match("%(\\d)\\$s").replacement((index, match) -> {