"Port marked as IGNORE: java/diablo-jre15" though not trying to upgrade

[Lars Stokholm]

Despite having already installed diablo-jre15 and despite it not needing 
an upgrade, if I delete the distfile, I get this when running 
'portupgrade -a':

** Port marked as IGNORE: java/diablo-jre15:
         :\n Because of licensing restrictions, you must fetch the 
distribution\n
  manually.  Please access\n \n 
http://www.FreeBSDFoundation.org/cgi-bin/download
?download=diablo-latte-freebsd6-i386-1.5.0_07-b01.tar.bz2\n \n with a 
web browse
r and \"Accept\" the End User License Agreement for\n \"Latte Diablo 
1.5.0\".  P
lease place the downloaded\n 
diablo-latte-freebsd6-i386-1.5.0_07-b01.tar.bz2 in
/usr/ports/distfiles.\n

I would have expected this message, if portversion showed that 
diablo-jre15 needed an upgrade, but as I said, it doesn't.

One way around it is to keep the distfile, but it seems kind of stupid 
if that's the only reason. Is there a real solution for this? Perhaps 
there's something wrong with portupgrade?