Fix (nil.to_s || "new") when changing visibility type for a new widget
Fix (nil.to_s || "new") when changing visibility type for a new widget

introduced in 0517b67 (#11074), it changes the observe url for new items from `*/widget_form_field_changed/new` to `*/widget_form_field_changed` when `@widget.id` is `nil` (new item)

https://bugzilla.redhat.com/show_bug.cgi?id=1388144

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