fix empty username fallback

scripts/songselect/songwheel.lua

@@ -556,7 +556,7 @@ function drawLocalLeaderboard(diff)
         local username = scoreTable and scoreTable.playerName
 
         -- if for some reason there's a score but no associated username, fall back to skin setting
-        if score and not username then
+        if score and username == "" then
             username = game.GetSkinSetting("username")
         end