Color validation doesn't evaluate channel values

Nobody has claimed this yet.

It looks like invalid color values are passing validation!

**mapbox-gl-style-spec version**: `11.1.1`

### Steps to Trigger Behavior

```js
import validateProperty from '@mapbox/mapbox-gl-style-spec/validate/validate_property'
import styleSpec from '@mapbox/mapbox-gl-style-spec/reference/v8.json'

const errors = validateProperty({
key: '',
layerType: 'line',
objectKey: 'line-color',
style: { glyphs: 'fake' },
value: 'hsl(, 100%, 59%)', // There's no value for hue here
styleSpec,
valueSpec: styleSpec['paint_line']['line-color']
}, 'paint');

// []

```

### Expected Behavior

An entry in the error array indicating the color value did not pass validation.

### Actual Behavior

An empty error array returns resulting in no error found.

Start by running the provided validateProperty reproduction against mapbox-gl-style-spec 11.1.1, then trace validation from validate/validate_property through the line-color value specification. The fix is done when a missing hue produces an error entry instead of an empty array, with regression coverage for this invalid color value.

Written by the indexing model from the issue text.