[BlackBerry] Check for valid element in elementTouched
https://bugs.webkit.org/show_bug.cgi?id=115205

Patch by Nima Ghanavatian <nghanavatian@blackberry.com> on 2013-04-26
Reviewed by Rob Buis.

Internally reviewed by Genevieve Mak.

PR 331546
We might receive a null ptr from nodeAsElementIfApplicable which
is passed in here. Check to make sure it's valid before using.

* WebKitSupport/InputHandler.cpp:
(BlackBerry::WebKit::InputHandler::elementTouched):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149206 268f45cc-cd09-0410-ab3c-d52691b4dbfc