fix embed queue

Catalogger.Backend/Database/Queries/QueryExtensions.cs

@@ -16,7 +16,7 @@ public static class QueryExtensions
         CancellationToken ct = default)
     {
         var guild = await db.Guilds.FindAsync(id);
-        if (guild == null) throw new Exception("oh");
+        if (guild == null) throw new CataloggerError("Guild not found, was not initialized during guild create");
         return guild;
     }
 }