Code:
program:
if field('#readorder') then
template('Reading List: {#readorder} #{#readorder_index:0>2s}')
else
if field('#fanficcat') then
template('{#fanficcat}')
fi
fi
This puts "PLUGBOARD TEMPLATE ERROR" on everything that's
not a fanfic or on a reading list.
I'm not sure how exactly to tell it to not put anything in there if those two don't apply.
(For reference, this is in the "subtitle" field on the KoboTouchExtended driver.)