[RFR] Added an interval for empty unit

[KittyGiraudel]

This PR allows media queries using unitless values, such as aspect-ratio:

.foo {
  @include media('aspect-ratio>1') {
    color: red;
  }
}

It would previously throw this error:

Unknown unit ``.

Ping @eduardoboucas.

[eduardoboucas]

Happy with this!

[KittyGiraudel]

Could you please release?

[eduardoboucas]

Will do.

[sertaconay]

Are you sure that aspect-ratio accepts integer value?
https://developer.mozilla.org/en-US/docs/Web/CSS/Media_Queries/Using_media_queries#aspect-ratio
https://www.w3.org/TR/css3-mediaqueries/#aspect-ratio

May I ask how we can write 'aspect-ratio: 4/3'?

[KittyGiraudel]

I won’t have time to tackle this question. Ping @eduardoboucas. :)

[eduardoboucas]

Really short on time as well. Will try to have a look soon.