[Version-unspecific] Don't increment sequence number for failed tx commit.Code 6
[Version-unspecific]
Intended to close #1505
'Is it correct or not to increment sequence number for commit.Code 6?'.
My current impression is that there is no reason for commit.Code 6 to increment the sequence number while all other codes greater than 0 do not.
For context, note that (my impression is that) returning nil
for commit.Code 6 is so that THORNode does not retry (endlessly?) a broadcast that cannot succeed.