- fixed http://bugzilla.opendarwin.org/show_bug.cgi?id=4493
          add qualifiedName checking for empty string

        * khtml/xml/dom_docimpl.cpp:
        (qualifiedNameIsValid): Added.
        (qualifiedNameIsMalformed): Added.
        (DOMImplementationImpl::createDocumentType): Added checks and exceptions using above functions.
        (DOMImplementationImpl::createDocument): Ditto.

        * layout-tests/dom/html/level2/core/createDocument08-expected.txt: Updated to expect success.
        * layout-tests/dom/html/level2/core/createDocumentType04-expected.txt: Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@10472 268f45cc-cd09-0410-ab3c-d52691b4dbfc