SPIGOT-7486: Alternate approach to null profile names

By: md_5 <git@md-5.net>

paper-server/src/main/java/org/bukkit/craftbukkit/CraftOfflinePlayer.java

@@ -60,7 +60,7 @@ public class CraftOfflinePlayer implements OfflinePlayer, ConfigurationSerializa
         }
 
         // This might not match lastKnownName but if not it should be more correct
-        if (profile.getName() != null) {
+        if (!profile.getName().isEmpty()) {
             return profile.getName();
         }