shouldn't put a message in  if it's not going to be printed anyway... oops; made Array#ensure_single exit with a nonzero exit code on error
shouldn't put a message in  if it's not going to be printed anyway... oops; made Array#ensure_single exit with a nonzero exit code on error

--HG--
extra : convert_revision : svn%3A177060d3-6165-4ab0-95eb-642399a075a8/nanoc/trunk%40440

gjtorikian/nanoc,RubenVerborgh/nanoc,remko/nanoc,nanoc/nanoc,legallybrown/nanoc,barraq/nanoc,hilohiro/nanoc