Setting { fill | line }-pattern to "" invalidates other { fill | line }-* properties

Nobody has claimed this yet.

Ticket to track the same issue in GL-JS that appears on GL-Native as documented in https://github.com/mapbox/mapbox-gl-native/issues/14331.

### Steps to reproduce

1. Set `line-pattern` to "" (empty string) on a layer.

### Expected behavior

Users who want to use a patterned and non-patterned line in the same layer can do so by setting `line-pattern` to `""` or `undefined`.

Users have reported trying to use this as a workaround for lack of DDS support in `line-dasharray` (https://github.com/mapbox/mapbox-gl-js/issues/3045). Similar behavior occurs if you try to render a patterned fill and non-patterned fill in the same layer.

### Actual behavior

Other paint properties such as `line-color` and `line-dasharray` are overwritten, so no line is drawn.

### Configuration
**Browser:** All
**Operating systems + versions:** All

Start by reproducing the issue with an empty line-pattern, then compare how line-pattern and fill-pattern affect other paint properties such as line-color and line-dasharray. Review the related GL-Native issue 14331 and GL-JS issue 3045 for context. Done means patterned and non-patterned lines or fills can coexist without other paint properties being overwritten.

Written by the indexing model from the issue text.