Correct the return value of getPlayerListName

By: Thinkofdeath <thinkofdeath@spigotmc.org>

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java

@@ -176,7 +176,7 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
 
     @Override
     public String getPlayerListName() {
-        return CraftChatMessage.fromComponent(getHandle().listName);
+        return getHandle().listName == null ? getName() : CraftChatMessage.fromComponent(getHandle().listName);
     }
 
     @Override