fix, PEBKAC, std strings are always init'd to be empty, so check str[0]

Signed-off-by: Sebastian Freundt <hroptatyr@fresse.org>
Merge branch 'feat/nicks' into next

* feat/nicks:
  fix, PEBKAC, std strings are always init'd to be empty, so check str[0]
  minor, prefer nick field (comboLegsDescrip) if present for tws_cont_nick()
  minor, snarf @nick off twsxml fragments, use comboLegsDescrip field for that
  minor, scan @nick attribute off twsxml documents