patch applied (haddock2): Let runtests.hs die when haddock has not been built

[Simon Marlow]

Wed Apr  7 14:48:57 PDT 2010  David Waern <david.waern at gmail.com>
  * Let runtests.hs die when haddock has not been built

    M ./tests/runtests.hs +4

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=haddock2;a=darcs_commitdiff;h=20100407214857-a762e-1bd57c1ef1aef814c513a6bab1f297187d5df49c.gz