https://bugs.webkit.org/show_bug.cgi?id=115176

Patch by Konrad Piascik <kpiascik@blackberry.com> on 2013-04-26
Reviewed by Joseph Pecoraro.

Source/WebCore:

findStorageArea was returning a null storageArea causing the items
input paramater to not be set.  This was happening without any error
being set at all.  Set an error to prevent a crash when we try to
convert the result to a JSON string.

Added tests to check if session and local storage are empty that
they are still functional.

* inspector/InspectorDOMStorageAgent.cpp:
(WebCore::InspectorDOMStorageAgent::getDOMStorageItems):

LayoutTests:

Tests to check that if local and session storage are empty
that they still work corerctly.

* inspector/storage-panel-dom-storage-empty-expected.txt: Added.
* inspector/storage-panel-dom-storage-empty.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149200 268f45cc-cd09-0410-ab3c-d52691b4dbfc