don't let the bot starts if any of the readys fails

src/EllieBot/Db/Models/xp/ExcludedItem.cs

@@ -2,7 +2,7 @@
 
 public class ExcludedItem : DbEntity
 {
-    public int XpSettingsId { get; set; }
+    public int? XpSettingsId { get; set; }
     public ulong ItemId { get; set; }
     public ExcludedItemType ItemType { get; set; }