Fix handling of empty font IDs and default DCP fonts (#2721) (part of #2722).

Previously we used an empty font ID as the default for when a subtitle
has no Font, but in #2721 we saw a DCP with an empty font ID which
raised an assertion (because we'd already added our default font with
the empty ID).

Here we try to fix this (and also make the default font correctly be
that from the first <LoadFont>).

1 files changed, 0 insertions, 0 deletions

diff --git a/test/data b/test/data
-Subproject a4ad4c1a4880d02aabf2790e11c4e5c2c28034d
+Subproject 314e09cbac2e023a7acb61e1b32db76fe6dd775