don't allow caching of file without a content-type
don't allow caching of file without a content-type

- this solves the early install problems where the user hasn't setup
  fastcgi yet and sends the php-source code out and the browser caches
  the file and it's content


git-svn-id: c4e9838fefcfae554524937a357000afc2bbf25b@1725 152afb58-edef-0310-8abb-c4023f1b3aa9

ctdk/lighttpd-1.4.x,ctdk/lighttpd-1.4.x,ctdk/lighttpd-1.4.x,ctdk/lighttpd-1.4.x