[core] Render a circle if either the color or stroke color are visible

This updates the circle paint check to pass if the circle stroke is
visible but:

* The circle color is clear
* The circle is transparent
* The circle has a radius of 0

Previously, a transparent circle or a circle with a radius of 0 would
cause the layer to be passed up even if the circle stroke color had a
non zero alpha.

1 files changed, 0 insertions, 0 deletions

diff --git a/mapbox-gl-js b/mapbox-gl-js
-Subproject 2af18eebca9173ca8e5cf15559f9b16d7c986fc
+Subproject fd73395ef71cf77993d717b2e23c5dab5e372b6