Currently, empty execution trace is printed incorrectly by the tool as an empty string.
This PR fixes this. It ensures that at least the executed actors (with their results) are always printed, event if the execution trace does not have any interesting trace points.
Currently, empty execution trace is printed incorrectly by the tool as an empty string. This PR fixes this. It ensures that at least the executed actors (with their results) are always printed, event if the execution trace does not have any interesting trace points.