Don't ignore parsing errors (#539)
Don't ignore parsing errors (#539)

If the request generates an error (e.g. HMAC verification failed) we shouldn't
just silently ignore it, the event will be nil so there's no point in going on.
We should return/log the error so someone can figure out what's going on.

Signed-off-by: Doug Davis <ff3bde741799c0eff815b83a54eda3fc494df54f@us.ibm.com>
knative-sandbox/eventing-camel,knative/eventing-contrib,knative-sandbox/eventing-prometheus,knative-sandbox/eventing-ceph,knative-sandbox/eventing-gitlab,knative-sandbox/eventing-natss,knative-sandbox/eventing-ceph,knative-sandbox/eventing-natss,knative/eventing-contrib,knative-sandbox/eventing-gitlab,knative-sandbox/eventing-awssqs,knative-sandbox/eventing-couchdb,knative-sandbox/eventing-kafka,knative-sandbox/eventing-awssqs,knative-sandbox/eventing-prometheus,knative-sandbox/eventing-camel,knative-sandbox/eventing-github,knative-sandbox/eventing-kafka,knative-sandbox/eventing-github,knative-sandbox/eventing-couchdb