fix: set pendingFeatures_ as object on init

src/ol/interaction/snapinteraction.js

@@ -94,6 +94,15 @@ ol.interaction.Snap = function(opt_options) {
    */
   this.indexedFeaturesExtents_ = {};
 
+  /**
+   * If a feature geometry changes while a pointer drag|move event occurs, the
+   * feature doesn't get updated right away.  It will be at the next 'pointerup'
+   * event fired.
+   * @type {Object.<number, ol.Feature>}
+   * @private
+   */
+  this.pendingFeatures_ = {};
+
   /**
    * Used for distance sorting in sortByDistance_
    * @type {ol.Coordinate}
@@ -174,16 +183,6 @@ goog.exportProperty(
     ol.interaction.Snap.prototype.addFeature);
 
 
-/**
- * If a feature geometry changes while a pointer drag|move event occurs, the
- * feature doesn't get updated right away.  It will be at the next 'pointerup'
- * event fired.
- * @type {Object.<number, ol.Feature>}
- * @private
- */
-ol.interaction.Snap.prototype.pendingFeatures_ = null;
-
-
 /**
  * @param {ol.Feature} feature Feature.
  * @private
@@ -602,9 +601,11 @@ ol.interaction.Snap.handleEvent_ = function(evt) {
  * @private
  */
 ol.interaction.Snap.handleUpEvent_ = function(evt) {
-  goog.array.forEach(goog.object.getValues(this.pendingFeatures_),
-      this.updateFeature_, this);
-  this.pendingFeatures_ = {};
+  var featuresToUpdate = goog.object.getValues(this.pendingFeatures_);
+  if (featuresToUpdate.length) {
+    goog.array.forEach(featuresToUpdate, this.updateFeature_, this);
+    this.pendingFeatures_ = {};
+  }
   return false;
 };