ComboBox empty text => index 0

Easier clearing of values; instead of saying "stuff is wrong", it's
obvious the user deleted the text so just set it to the 0th item.

PKX/f1-Main.cs

@@ -2060,6 +2060,8 @@ private void validateComboBox(object sender)
 
             ComboBox cb = (ComboBox)sender;
             cb.SelectionLength = 0;
+            if (cb.Text == "")
+            { cb.SelectedIndex = 0; return; }
             cb.BackColor = cb.SelectedValue == null ? Color.DarkSalmon : defaultControlWhite;
         }
         private void validateComboBox(object sender, EventArgs e)