Check for empty callback
Check for empty callback

tortxof/OpenBazaar,saltduck/OpenBazaar,kordless/OpenBazaar,bankonme/OpenBazaar,freebazaar/FreeBazaar,bglassy/OpenBazaar,hoffmabc/OpenBazaar,dlcorporation/openbazaar,saltduck/OpenBazaar,habibmasuro/OpenBazaar,mirrax/OpenBazaar,tortxof/OpenBazaar,freebazaar/FreeBazaar,saltduck/OpenBazaar,atsuyim/OpenBazaar,atsuyim/OpenBazaar,mirrax/OpenBazaar,mirrax/OpenBazaar,NolanZhao/OpenBazaar,yagoulas/OpenBazaar,im0rtel/OpenBazaar,dionyziz/OpenBazaar,dlcorporation/openbazaar,habibmasuro/OpenBazaar,hoffmabc/OpenBazaar,hoffmabc/OpenBazaar,freebazaar/FreeBazaar,akhavr/OpenBazaar,yagoulas/OpenBazaar,bglassy/OpenBazaar,Renelvon/OpenBazaar,dionyziz/OpenBazaar,dionyziz/OpenBazaar,must-/OpenBazaar,dlcorporation/openbazaar,kordless/OpenBazaar,saltduck/OpenBazaar,bglassy/OpenBazaar,NolanZhao/OpenBazaar,NolanZhao/OpenBazaar,yagoulas/OpenBazaar,blakejakopovic/OpenBazaar,habibmasuro/OpenBazaar,bankonme/OpenBazaar,im0rtel/OpenBazaar,matiasbastos/OpenBazaar,habibmasuro/OpenBazaar,Renelvon/OpenBazaar,STRML/OpenBazaar,dionyziz/OpenBazaar,freebazaar/FreeBazaar,dlcorporation/openbazaar,rllola/OpenBazaar,akhavr/OpenBazaar,hoffmabc/OpenBazaar,kordless/OpenBazaar,Renelvon/OpenBazaar,akhavr/OpenBazaar,bglassy/OpenBazaar,rllola/OpenBazaar,NolanZhao/OpenBazaar,must-/OpenBazaar,matiasbastos/OpenBazaar,hoffmabc/OpenBazaar,dionyziz/OpenBazaar,bankonme/OpenBazaar,tortxof/OpenBazaar,im0rtel/OpenBazaar,mirrax/OpenBazaar,STRML/OpenBazaar,matiasbastos/OpenBazaar,STRML/OpenBazaar,im0rtel/OpenBazaar,blakejakopovic/OpenBazaar,STRML/OpenBazaar,blakejakopovic/OpenBazaar,Renelvon/OpenBazaar,atsuyim/OpenBazaar,must-/OpenBazaar,tortxof/OpenBazaar,dlcorporation/openbazaar,yagoulas/OpenBazaar,matiasbastos/OpenBazaar,akhavr/OpenBazaar,rllola/OpenBazaar,freebazaar/FreeBazaar,hoffmabc/OpenBazaar,atsuyim/OpenBazaar,rllola/OpenBazaar,bankonme/OpenBazaar,blakejakopovic/OpenBazaar,must-/OpenBazaar,akhavr/OpenBazaar,dlcorporation/openbazaar,kordless/OpenBazaar