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Some QWKnet vote messages are failing:
evnt unpackREP <ENSEMBLE> !ERROR 2 (No such file or directory) in qwk.cpp line 1146 (qwk_vote) writing "/sbbs/data/subs/dove-gen" access=-105 info=smb_addvote thread_back field missing

Catch this problem a little higher up (in votemsg()) and log the message's reply-IDs to help determine what's the root-cause here. Don't bother calling smb_addvote() if thread_back is 0.