[Tizen][Runtime] Fix bug: crash on installation of a wgt without application
element in config.xml

According to
https://source.tizen.org/sites/default/files/page/tizen-2.2-wrt-core-spec.pdf
<tizen:application / > MUST occurrence one time.

If application element is not found in manifest, the parser should
 stop and the installation will fail.
Merge pull request #2190 from CooderIan/fix_tizen_application_handler

[Tizen][Runtime] Fix bug: crash on installation of a wgt without application element in config.xml