choropleth: add dummy hover handler to skip Fx.hover w/o warnings

- until we make choropleth use fullLayout._hoverlayer for
  its hover labels.

Author: etpinard

src/traces/choropleth/index.js

@@ -17,6 +17,9 @@ Choropleth.colorbar = require('../heatmap/colorbar');
 Choropleth.calc = require('./calc');
 Choropleth.plot = require('./plot').plot;
 
+// add dummy hover handler to skip Fx.hover w/o warnings
+Choropleth.hoverPoints = function() {};
+
 Choropleth.moduleType = 'trace';
 Choropleth.name = 'choropleth';
 Choropleth.basePlotModule = require('../../plots/geo');

src/traces/choropleth/plot.js

@@ -59,9 +59,8 @@ plotChoropleth.calcGeoJSON = function(trace, topojson) {
 };
 
 plotChoropleth.plot = function(geo, calcData, geoLayout) {
-    function keyFunc(d) {
-        return d[0].trace.uid;
-    }
+
+    function keyFunc(d) { return d[0].trace.uid; }
 
     var framework = geo.framework,
         gChoropleth = framework.select('g.choroplethlayer'),