.format_article(): Archiving would occasionally fail when an empty

line occurred at the beginning of an article - because the
space-preserving format style would try to prepend "<pre>" to the None
object that's used as a place holder.  Instead of doing string
concatenation, i'm doing the simpler [].insert(0...) and [].append()
to the list of lines.  (It'd probably also be a good idea to fix the
code to not use the None place holders, but it's hard to tell what
depends on what there.)

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