Reviewed by Ken.

    Reviewed by Ken.

	- remove assertions that asserted text is non-empty, just avoid
	doing anything for the empty case; this is needed because input
	methods like to insert empty text in various cases.

        * khtml/editing/htmlediting_impl.cpp:
        (khtml::InsertTextCommandImpl::InsertTextCommandImpl):
        (khtml::InsertTextCommandImpl::doApply):
        (khtml::InsertTextCommandImpl::doUnapply):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@7182 268f45cc-cd09-0410-ab3c-d52691b4dbfc