be_sync: avoid crashing on files in the root of a DB

If a sync DB is malformed and contains entries in the root of the
archive, load_pkg_for_entry will leave the 'filename' variable empty,
leading to a crash in the ensuing strcmp() calls which determine the DB
fragment being examined.

While this isn't a read error, this should be reported to the user so
that it can be addressed by the creator of the DB.

As seen: https://bbs.archlinux.org/viewtopic.php?pid=1297766

Signed-off-by: Dave Reisner <dreisner@archlinux.org>

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