add condition to verify map-geometry is legit

Author: AliyanH

src/map-feature.js

@@ -280,7 +280,8 @@ export class MapFeature extends HTMLElement {
     if (!this.querySelector('map-geometry')) return;
     let fallbackCS = this._getFallbackCS();
     let content = parentLayer.src ? parentLayer.shadowRoot : parentLayer;
-    this._geometry = layerToAddTo.createGeometry(this, fallbackCS); // side effect: extends `this` with this._groupEl, points to svg g element that renders to map SD
+    this._geometry = layerToAddTo.createGeometry(this, fallbackCS); // side effect: extends `this` with this._groupEl if successful, points to svg g element that renders to map SD
+    if (!this._geometry) return;
     layerToAddTo.addLayer(this._geometry);
     this._setUpEvents();
   }

src/mapml/layers/FeatureLayer.js

@@ -427,7 +427,7 @@ export var FeatureLayer = L.FeatureGroup.extend({
       options.zoomBounds = feature.extent.zoom;
     }
     let geometry = this._geometryToLayer(feature, options, cs, +zoom, title);
-    if (geometry) {
+    if (geometry && Object.keys(geometry._layers).length !== 0) {
       // if the layer is being used as a query handler output, it will have
       // a color option set.  Otherwise, copy classes from the feature
       if (!geometry.options.color && feature.hasAttribute('class')) {