5723003 rpmbuild: catch FileNotFound on el6 correctly

1 file Authored by praiskup 3 years ago, Committed by praiskup 3 years ago,
    rpmbuild: catch FileNotFound on el6 correctly
    
    And also use '{0}'.format() instead of '{}'.format(), to fix el6
    problems.
    
    While I'm on it, I re-format the error message so it is a bit more
    informative about the errno.ENOENT.