message: Fix border rendering of transparent `Container`
  Fixes
diff: @@ -56,10 +56,7 @@ pub(crate) fn background(
  bounds: Rectangle,
  style: &container::Style,
  ) -> Option<Primitive> {
  - if style.background.is_none() && style.border_width > 0 {
  - return None;
  - }
  -
  + if style.background.is_some() || style.border_width > 0 {
  Some(Primitive::Quad {
  bounds,
  background: style
  @@ -69,4 +66,7 @@ pub(crate) fn background(
  border_width: style.border_width,
  border_color: style.border_color,
  })
  + } else {
  + None
  + }
  }
  