assembly: fix synchronization race condition

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
genomics: fix regression added in b1754ea12

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>
genomics: don't send empty payload

Signed-off-by: Sébastien Boisvert <boisvert@anl.gov>