Problem on deselect in MapView

[emartinez-usgs]

Reported from user email. Could not immediately reproduce. Needs confirmation...

There is a JS bug using the latest Chrome desktop browser (Version 59.0.3071.115 (Official Build) (64-bit)):

Open the map
Click on an earthquake in the list
Mouse down and drag the map

On mouse up, the following JS

error occurs and the map can no longer be dragged:

index.js:3 Uncaught TypeError: Cannot read property 'length' of null at Object.b.isFilterEnabled (index.js:3) at Object.b.deselectEventonMoveEnd (index.js:3) at Object.b.onMoveEnd (index.js:3) at Object.n (index.js:3) at e.fireEvent (leaflet.js:6) at e._onDragEnd (leaflet.js:8) at e.fireEvent (leaflet.js:6) at e._onUp (leaflet.js:8) at HTMLDocument.s (leaflet.js:8)

This error does not occur with IE or FireFox.

[jmfee-usgs]

I'm unable to reproduce the issue, but based on the stack trace the problem appears to be here in the source:
https://github.com/usgs/earthquake-latest-earthquakes/blob/master/src/htdocs/js/map/MapView.js#L288

Not sure when _this.model.get('restrictListToMap') would return null, but that should be checked:

if (filter && filter.length === 0)