Fix punctuation even when Black Card has no blanks
Fix punctuation even when Black Card has no blanks

The code path for build_plays() when the Black Card had no blanks
(implicit single blank at end of text) was immediately returning the
play text without fixing any erroneous punctuation.

This change feeds either play text through the punctuation fixer.

Fixes #8.

jshholland/pah-irc,grifferz/pah-irc