[Kst] [Kst-plot/kst] 7017d9: be 100% backward compatible

[Peter Kümmel]

  Branch: refs/heads/master
  Home:   https://github.com/Kst-plot/kst
  Commit: 7017d9540c52d5aae803097d4db351c39027eb0e
      https://github.com/Kst-plot/kst/commit/7017d9540c52d5aae803097d4db351c39027eb0e
  Author: Peter Kümmel <syntheticpp at gmx.net>
  Date:   2013-12-03 (Tue, 03 Dec 2013)

  Changed paths:
    M src/datasources/ascii/kst_atof.cpp

  Log Message:
  -----------
  be 100% backward compatible

return what ever the parser finds for NaNMode::NullValue