small bug, problem with build (since 4.3.13 ?)

Hello.

xymon/build/Makefile.rules contains 
find $(INSTALLROOT)$(INSTALLWWWDIR) -type f -print0 | xargs -0 chmod 644

what about to change it ? For example to
find $(INSTALLROOT)$(INSTALLWWWDIR) -type f -exec chmod 644 {} \;

Some time $(INSTALLWWWDIR) may be empty. Building brake at this case:

make[1]: Leaving directory `/home/builder/RPM/BUILD/xymon-4.3.13/web'
find /home/builder/tmp-build/xymon-buildroot/var/www/xymon -type f -print0 | xargs -0 chmod 644
chmod: missing operand after `644'
Try `chmod --help' for more information.

-- 
Regards,
Sergey