Utilities API. Checking for the existence of required fields

Created by: Psixodelik

Faced a problem while adding new utilities. I made a mistake in the name of the values field. No new classes were added during compilation. The API does not respond to the fact that a required field exists, which is wrong from a code design point of view.

I suggest adding a check for the existence of the required fields property and values. If there are no fields, then throw an error when compiling SASS.