Fix blessing of new reference files

Adding of new reference files wasn't handled correctly. It was trying to
read a file that didn't exist yet.

Instead of unwrapping, we now treat a missing reference file as empty
(`Vec::new`). This makes the following conditional work. We then also
have to re-read the reference file after it was being copied. This
second read is technically the same as in the old shell script, but
wasn't really obvious. The shell script did a `-s` test which reads the
file.

0 files changed, 0 insertions, 0 deletions