only set card-power if there is power Fixes #766
only set card-power if there is power
Fixes #766

jeremylarner/ringteki,ystros/throneteki,samuellinde/throneteki,Antaiseito/throneteki_for_doomtown,gryffon/ringteki,gryffon/ringteki,Antaiseito/throneteki_for_doomtown,jeremylarner/ringteki,samuellinde/throneteki,cryogen/throneteki,DukeTax/throneteki,cryogen/gameteki,jbrz/throneteki,jeremylarner/ringteki,cryogen/gameteki,cryogen/throneteki,DukeTax/throneteki,gryffon/ringteki,jbrz/throneteki