modify feature control must use silent:true when removing/destroying vertices, p=me, r=crschmidt (closes #1562)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@7614 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

tests/Control/ModifyFeature.html

@@ -213,6 +213,11 @@
         control.selectFeature({feature: fakeFeature});
         
         control.destroy();
+
+        // layer.destroy() will call removeFeatures with an empty array, make
+        // removeFeatures reference an empty function to prevent the above
+        // test to fail
+        layer.removeFeatures = function(features) {};
         layer.destroy();
     }  
 
@@ -323,6 +328,11 @@
         control.dragComplete();
         
         control.destroy();
+
+        // layer.destroy() will call removeFeatures with an empty array, make
+        // removeFeatures reference an empty function to prevent the above
+        // test to fail
+        layer.removeFeatures = function(verts) {};
         layer.destroy();
     }