Even when a mediapackage doesn't have a track or a source flavor or source tag, the compose workflow operation still shows as succeeded after execution.
The reason seems to be that the 'Action' in the ComposeWorkflowOperationHandler is always set to 'CONTINUE' despite the absence of track or source tag or source flavor.
Ideally it should be set to 'SKIP' when such elements are missing.
Steps to reproduce:
1. Run the 'compose' workflow operation on a mediapackage which has no track or missing source tag.
compose status is set to SUCCEEDED
compose status should be 'SKIP'