Potential issue with con_real generation in 1st level FSF

[mih]

mk_level1_fsf.py contains this bit in the part that generates custom contrasts.

            for evt in range(nevs):
                if contrasts[c][evt]!=0:
                    outfile.write('set fmri(con_real%d.%d) %s\n'%(contrastctr,con_real_ctr,contrasts[c][evt]))
                    outfile.write('set fmri(con_real%d.%d) 0\n'%(contrastctr,con_real_ctr+1))
                    con_real_ctr+=2

                else:
                    outfile.write('set fmri(con_real%d.%d) 0\n'%(contrastctr,evt+1))

I am not sure whether I fully grok it, but isn't it necessary to increment the con_real_ctr regardless of whether a particular contrast vector element is zero? Otherwise it seems to mess of the con_real specification with duplicate IDs. Moreover, why does it need this special case at all? It should be safe to write out the con_real pair even when the value is zero.

Sorry if this is a false alarm.