Bug 35819: nack and not requeue if frame is invalid

Bug 35819: nack and not requeue if frame is invalid

If a frame cannot be correctly processed (most probably because the body
is not valid JSON) then we are not acking or nacking the frame and the
worker is stuck.

In this specific case we should nack without requeuing the frame.

NOTE that requeue must be 'true' or 'false', not 1 or 0, or the default
'true' will be used.

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>