Fixed issue 531 by preventing attempt to transform a metadata element

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@1512 eee81c28-f429-11dd-99c0-75d572ba1ddd

editor/svgcanvas.js

@@ -2170,6 +2170,10 @@ function BatchCommand(text) {
 					ty = 0;
 					if (child.nodeType == 1) {
 						var childTlist = canvas.getTransformList(child);
+
+						// some children might not have a transform (<metadata>, <defs>, etc)
+						if (!childTlist) continue;
+
 						var m = transformListToTransform(childTlist).matrix;
 					
 						var angle = canvas.getRotationAngle(child);