zts_harvester_delivery_pipeline: do not upload empty output files
zts_harvester_delivery_pipeline: do not upload empty output files

ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools,ubtue/ub_tools