entity hider: check for players with no names

Not sure why this happens but we have stacktraces of isFriend crashing
due to a player not having a name (yet?). It looks like the names are
sent separately from the player spawn in the protocol.

runelite-mixins/src/main/java/net/runelite/mixins/EntityHiderMixin.java

@@ -139,6 +139,12 @@ public abstract class EntityHiderMixin implements RSScene
 					}
 				}
 
+				if (player.getName() == null)
+				{
+					// player.isFriend() and player.isClanMember() npe when the player has a null name
+					return false;
+				}
+
 				return (!hideFriends && player.isFriend()) || (!isLocalPlayer && !hideClanMates && player.isClanMember());
 			}
 		}