Reviewed by Dave Harrison

    Reviewed by Dave Harrison

        - fixed <rdar://problem/4769772> Problem with Find on certain PDF page

        * WebView/WebPDFView.mm:
        (-[WebPDFView _scaledAttributedString:]):
        We were hitting an exception trying to set the font attribute to nil, which was happening because
        the result of -[PDFSelection attributedString] had no attributes. That PDFSelection bug is now
        filed separately, but this works around the exception.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@20498 268f45cc-cd09-0410-ab3c-d52691b4dbfc