fix #643, when element has no style attribute

Author: jtangelder

src/manager.js

@@ -262,6 +262,9 @@ Manager.prototype = {
  */
 function toggleCssProps(manager, add) {
     var element = manager.element;
+    if(!element.style) {
+        return;
+    }
     each(manager.options.cssProps, function(value, name) {
         element.style[prefixed(element.style, name)] = add ? value : '';
     });

src/touchaction.js

@@ -32,7 +32,7 @@ TouchAction.prototype = {
             value = this.compute();
         }
 
-        if (NATIVE_TOUCH_ACTION) {
+        if (NATIVE_TOUCH_ACTION && this.manager.element.style) {
             this.manager.element.style[PREFIXED_TOUCH_ACTION] = value;
         }
         this.actions = value.toLowerCase().trim();