Fixing a bug in actor unit testing causing use of --path option to crash. Cause was changes introduced by the recently added actor signing code changing the return type of load_actor in store.
Fixing a bug in actor unit testing causing use of --path option to crash. Cause was changes introduced by the recently added actor signing code changing the return type of load_actor in store.

EricssonResearch/calvin-base,EricssonResearch/calvin-base,EricssonResearch/calvin-base,EricssonResearch/calvin-base