add logging for failed transaction sends
add logging for failed transaction sends

mharkus/Sia,MrStrong/Sia,ChrisSchinnerl/Sia,ericflo/Sia,mtlynch/Sia,ericflo/Sia,MrStrong/Sia,NebulousLabs/Sia,mharkus/Sia,NebulousLabs/Sia,ChrisSchinnerl/Sia,mtlynch/Sia