Comment 2 for bug 570625

I think the offending code is in commands/check:

#!/bin/sh -e
empty=
for pkg in $(dh_listpackages -s | grep -- '-di$'); do
 if [ -z "$(find debian/$pkg -type f)" ]; then
  echo "$pkg will be empty" >&2
  empty=1
 fi
done
if [ "$empty" ]; then
 exit 1
fi

I think we can get by with just emitting a warning and not returning an error.