If the fake target of a port installed an empty (0-byte) file as a

manual page, pkg_create(1) asked groff to process the empty file,
which failed, and then decided to install the empty file as a source
manual page, which later caused mandoc(1) called from man(1) to
complain to the end-user.  Instead, detect the emptiness in time,
skip the formatting attempt, skip the file, process the packing
list to its end, then abort pkg_create(1) unsuccessfully such that
the porter sees the problem and can fix whatever the root cause is.

Problem reported by naddy@ as seen in p5-Carp-Datum during a bulk build,
solution is joint work with espie@, again tested in a bulk by naddy@;
"please commit" espie@.

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