prtsweep should ignore httpup if not found

gistfile1.txt

# prtsweep -a -d
awk: fatal: cannot open file `/etc/ports/*.httpup' for reading (No such file or directory)
=======> /usr/ports/contrib/dev86
+ removing file dev86-copt.patch
=======> /usr/ports/contrib/ladspa
+ removing file ladspa-1.12.patch
=======> /usr/ports/contrib/lxmusic
+ removing file post-remove
=======> /usr/ports/contrib/lxpanel
+ removing file gmodule_link.patch
=======> /usr/ports/contrib/pjsip
+ removing file pjsip-sdl.patch
=======> /usr/ports/contrib/smpeg
+ removing file generate
=======> /usr/ports/contrib/wxgtk
+ removing file wxgtk-freeze.patch
=======> /usr/ports/contrib/xplanet
+ removing file xplanet-1.2.1.patch
=======> ERROR: '/usr/ports/core/COPYING' is not a directory!

Usage: prtsweep [-a] [-d] [-n] [PORTDIR ...]

# pwd
/root

# ls /etc/ports/
compat-32.pub		  contrib.rsync  core.rsync  opt.pub	xorg.pub    xorg.rsync.inactive
compat-32.rsync.inactive  core.pub	 drivers     opt.rsync	xorg.rsync