allow using guest profiles only once,

bugfix: update table rows visibility in main screen

PartyModeChallenge/PartyScreenChallengeMain.cs

@@ -355,10 +355,10 @@ namespace Vocaluxe.PartyModes
 
             for (int i = 0; i < Table.Count; i++)
             {
+                TableRow row = Table[i];
+
                 if (i < GameState.ResultTable.Count)
                 {
-                    TableRow row = Table[i];
-
                     row.Pos.Visible = true;
                     row.Name.Visible = true;
                     row.Rounds.Visible = true;
@@ -372,6 +372,15 @@ namespace Vocaluxe.PartyModes
                     row.SingPoints.Text = GameState.ResultTable[i].SumSingPoints.ToString();
                     row.GamePoints.Text = GameState.ResultTable[i].NumGamePoints.ToString();
                 }
+                else
+                {
+                    row.Pos.Visible = false;
+                    row.Name.Visible = false;
+                    row.Rounds.Visible = false;
+                    row.Won.Visible = false;
+                    row.SingPoints.Visible = false;
+                    row.GamePoints.Visible = false;
+                }
             }
         }
     }