Don't append "Disabled: " to menu tooltip if disabled reason is empty

In some cases we set a disabled reason but leave the text empty, so that we
don't get an error toast when the item is invoked. In such a case it looks
awkward if there is a tooltip showing "Disabled: " with no following text.

Author: stefanhaller

pkg/gui/controllers/helpers/confirmation_helper.go

@@ -348,7 +348,7 @@ func (self *ConfirmationHelper) IsPopupPanelFocused() bool {
 
 func (self *ConfirmationHelper) TooltipForMenuItem(menuItem *types.MenuItem) string {
 	tooltip := menuItem.Tooltip
-	if menuItem.DisabledReason != nil {
+	if menuItem.DisabledReason != nil && menuItem.DisabledReason.Text != "" {
 		if tooltip != "" {
 			tooltip += "\n\n"
 		}