Consider a Point or Size null if one of the components is null.

src/svg/SVGImport.js

@@ -43,15 +43,15 @@ new function() {
 	function getPoint(node, x, y, allowNull) {
 		x = getValue(node, x, false, allowNull);
 		y = getValue(node, y, false, allowNull);
-		return allowNull && x == null && y == null ? null
-				: new Point(x || 0, y || 0);
+		return allowNull && (x == null || y == null) ? null
+				: new Point(x, y);
 	}
 
 	function getSize(node, w, h, allowNull) {
 		w = getValue(node, w, false, allowNull);
 		h = getValue(node, h, false, allowNull);
-		return allowNull && w == null && h == null ? null
-				: new Size(w || 0, h || 0);
+		return allowNull && (w == null || h == null) ? null
+				: new Size(w, h);
 	}
 
 	// Converts a string attribute value to the specified type