Gittrac #3882:  Fixed this (although the fix still needs some more
testing).  The fix is that we check whether a valid version is
defined in the .condor.sub file, rather than essentially assuming
that we have a valid version.
Merge branch 'V8_0-gittrac_3882-branch' of /p/condor/repository/CONDOR_SRC into V8_0-gittrac_3882-branch