Index out of bounds when creating a new game configuration with no builds

[LogicAndTrick]

http://bugs.sledge-editor.com/Bug/View/5 /6 /8 /9 /10

InvalidArgument=Value of '0' is not valid for 'SelectedIndex'.
Parameter name: SelectedIndex (System.ArgumentOutOfRangeException)
   at System.Windows.Forms.ComboBox.set_SelectedIndex(Int32 value)
   at Sledge.Editor.Settings.SettingsForm.UpdateSelectedGame()
   at Sledge.Editor.Settings.SettingsForm.GameSelected(Object sender, TreeViewEventArgs e)
   at System.Windows.Forms.TreeView.OnAfterSelect(TreeViewEventArgs e)