Firing an action if user clicks the trash control regardless of selection

Nobody has claimed this yet.

Mapbox GL Version: 0.45.0
Mapbox GL Draw Version: 1.0.9

### Steps to Trigger Behavior

1. Click trash icon

### Expected Behavior
Event to fire

### Actual Behavior
No change or action fired

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Hello --

I was wondering if an action fires when a user clicks the trash can icon when there is nothing selected.

I have a very simple mapbox draw component that users can draw a single polygon on. I am noticing that they are clicking the trash icon without selecting their polygon. I am wondering if an action fires when they click the trash (or how I can set one up) so that it will call deleteAll().

Either that or is there a way to modify the css of the trash icon when nothing is selected so I can make it look disabled?

Thanks!

Start by tracing the trash control's click handling and its selection-dependent behavior; the issue names no file or test. Done requires a defined behavior when nothing is selected, such as an action that invokes deleteAll() or disabled visual treatment, with coverage for the empty-selection case.

Written by the indexing model from the issue text.