Reviewed by Darin.

        * Scripts/svn-apply: Speed up isDirectoryEmptyForRemoval() by returning as soon as we find
        that the directory is not empty instead of reading in every single file and directory first,
        then checking the count.  Avoid warning in removeDirectoriesIfNeeded() if $svnOutput is not
        defined.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@15039 268f45cc-cd09-0410-ab3c-d52691b4dbfc