Fix NullPointerException in PlayerRadarHud when switching servers (#6465)

Author: Federicorao

src/main/java/meteordevelopment/meteorclient/systems/hud/elements/PlayerRadarHud.java

@@ -203,6 +203,7 @@ public void render(HudRenderer renderer) {
     private List<AbstractClientPlayer> getPlayers() {
         players.clear();
         players.addAll(mc.level.players());
+        players.removeIf(entity -> entity == null);
         if (players.size() > limit.get()) players.subList(limit.get() - 1, players.size() - 1).clear();
         players.sort(Comparator.comparingDouble(e -> e.distanceToSqr(mc.getCameraEntity())));