check for presence of ObjectManager in ObjectManagerAwareInterface job before clearing
Merge pull request #80 from basz/fix/clearing-object-manager-job

check for presence of ObjectManager in ObjectManagerAwareInterface job before clearing
conditional on queue interface instead on worker instance
Merge pull request #81 from basz/fix/consistent-context-check

conditional on queue interface instead on worker instance
fix test
Merge pull request #82 from basz/fix/consistent-context-check

fix test