jobs: only update mp ticker for blm
jobs: only update mp ticker for blm

When jobs change (and umbral stacks go away) update mp ticker, but
no need to check for that on every jobDetail change.

Also, jobDetail can be null (if nothing has changed) and so handle
that case to avoid a spew of errors.

quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot,quisquous/cactbot