Commented Issue: Action link generation convention throws Null Ref when there is no entity set. [540]

Currently the other links like Edit, Self do not generate links when no EntitySet is found. We would need to follow similarly in Action link generation too.
Comments: Unable to repro the issue. I'm seeing the following SerializationException instead: The related entity set could not be found. The related entity set is required to serialize the payload. not a NullRef when serializing entities or entity sets.