Merge remote-tracking branch 'upstream/master' into fix/web-driver-tests-v7

Conflicts:
	config/webpack.production.config.js
	package-lock.json
	package.json

src/components/layers/LayerEditor.jsx

@@ -112,6 +112,11 @@ export default class LayerEditor extends React.Component {
       comment = this.props.layer.metadata['maputnik:comment']
     }
 
+    let sourceLayerIds;
+    if(this.props.sources.hasOwnProperty(this.props.layer.source)) {
+      sourceLayerIds = this.props.sources[this.props.layer.source].layers;
+    }
+
     switch(type) {
       case 'layer': return <div>
         <LayerIdBlock
@@ -129,8 +134,9 @@ export default class LayerEditor extends React.Component {
           onChange={v => this.changeProperty(null, 'source', v)}
         />
         }
-        {this.props.layer.type !== 'raster' && this.props.layer.type !== 'background' && <LayerSourceLayerBlock
-          sourceLayerIds={this.props.sources[this.props.layer.source].layers}
+        {['background', 'raster', 'hillshade', 'heatmap'].indexOf(this.state.type) < 0 &&
+        <LayerSourceLayerBlock
+          sourceLayerIds={sourceLayerIds}
           value={this.props.layer['source-layer']}
           onChange={v => this.changeProperty(null, 'source-layer', v)}
         />