fixed a regression that caused incorrect positioning of rotated graphics when they are not rendered for the 1st time. r=elemoine (closes #2596)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10258 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/SVG.js

@@ -340,7 +340,7 @@ OpenLayers.Renderer.SVG = OpenLayers.Class(OpenLayers.Renderer.Elements, {
             }
 
             var rotation = style.rotation;
-            if (node._rotation !== rotation && pos) {
+            if ((rotation !== undefined || node._rotation !== undefined) && pos) {
                 node._rotation = rotation;
                 rotation |= 0;
                 if(node.nodeName !== "svg") {