fixed 'null' is not an object in .../ui/appframework.ui.js, line 3015
in af.touchlayer.js
2nd fix: 'null' is not an object in .../ui/appframework.ui.js, line 3015
Merge pull request #325 from dpesch/fix2.0/scrollendNullException

fixed 'null' is not an object in .../ui/appframework.ui.js, line 3015