Changes by: Aleksey Nogin (nogin at metaprl.org)
Date: 2011-02-10 10:10:00 -0800 (Thu, 10 Feb 2011)
Revision: 13259
Log message:

      Previously, even with USEPDFLATEX=True, the rules for the .tex->.dvi->.ps path
     using regular latex would still be created despiute them being potentially
     invalid. Worse, the .ps file would still be returned by the LaTeXDocument
     resulting in these potentially invalid rules actually being executed.