[GSAS-II] Bug in export of sequential results

[Toby, Brian H.]

I put in a fix that works for me. Please try. 

I also changed the selection code so that if no columns are selected, the program provides a selection window. 

Brian


> On Mar 28, 2019, at 11:00 AM, Ivo Alxneit via GSAS-II <gsas-ii at aps.anl.gov> wrote:
> 
> Dear all,
> 
> Exporting results of sequential refinements fails for histograms that do
> not use all phases. Exporting (text, but CSV probably the same) WgtFract
> of the attached gpx-files produces the errors below.
> 0:* -> fine
> 1:* -> error, one line in text file
> 2:* -> error, empty text file
> 
>