Check for empty callback
Check for empty callback

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