Bring back cat to the pipe

For some strange reason, the tee pipe did not work unless stuffed by cat
(all the output pipes remained empty)

include/www.sh

         #
         mkfifo maybe_uris maybe_ids maybe_exprs maybe_kws \
                uris uris_from_ids uris_from_exprs uris_from_kws
-        tee maybe_uris maybe_ids maybe_exprs maybe_kws >/dev/null &
+        cat | tee maybe_uris maybe_ids maybe_exprs maybe_kws >/dev/null &
         ##
         # process each pipe *async* by different filter
         #