Fixed bug introduced by fixing a pylint error
Fixed bug introduced by fixing a pylint error

Here first was very much intentionally set to None, as later on we
check if it is none in an 'first if first else exception' statement.

Patch by: Sverre Rabbelier

--HG--
extra : convert_revision : svn%3A32761e7d-7263-4528-b7be-7235b26367ec/trunk%402840

rhyolight/nupic.son,rhyolight/nupic.son,rhyolight/nupic.son