Fix error when item has no GP value.
Fix error when item has no GP value.

hayword/tfatf_epgp,ceason/epgp-tfatf,hayword/tfatf_epgp,sheldon/epgp,sheldon/epgp,protomech/epgp-dkp-reloaded,protomech/epgp-dkp-reloaded,ceason/epgp-tfatf