From fb242b5316f91ecf088d6eed04496b8a24e01f38 Mon Sep 17 00:00:00 2001
From: Paul Spencer <paul@pagameba.com>
Date: Tue, 12 Aug 2014 20:27:17 -0400
Subject: [PATCH] Return rather than fail if resolution is not defined

---
 src/ol/source/clustersource.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/ol/source/clustersource.js b/src/ol/source/clustersource.js
index 0e5455a143..888298e444 100644
--- a/src/ol/source/clustersource.js
+++ b/src/ol/source/clustersource.js
@@ -89,9 +89,11 @@ ol.source.Cluster.prototype.onSourceChange_ = function() {
  * @private
  */
 ol.source.Cluster.prototype.cluster_ = function() {
+  if (!goog.isDef(this.resolution_)) {
+    return;
+  }
   goog.array.clear(this.features_);
   var extent = ol.extent.createEmpty();
-  goog.asserts.assert(goog.isDef(this.resolution_));
   var mapDistance = this.distance_ * this.resolution_;
   var features = this.source_.getFeatures();