Adding a check to make sure features have a geometry before entering the cluster algorithm. r=crschmidt (closes #1816)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@8316 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Strategy/Cluster.html

@@ -56,6 +56,9 @@
             );
         }
         
+        // add one additional feature, with no geometry - just to confirm it doesn't break things
+        features.push(new OpenLayers.Feature.Vector());
+        
         map.setCenter(new OpenLayers.LonLat(0, 0), 0);
         layer.addFeatures(features);
         
@@ -63,7 +66,7 @@
         // threshold: 4 * 20 = 80 units
         // one cluster
         t.eq(layer.features.length, 1, "[4] layer has one cluster");
-        t.ok(featuresEq(layer.features[0].cluster, features), "[4] cluster includes all features");
+        t.ok(featuresEq(layer.features[0].cluster, features.slice(0, 80)), "[4] cluster includes all features with geometries");
         
         // resolution 2
         // threshold: 2 * 20 = 40 units