Put result in quotes

When a result is the empty string is is hard/confusing
to look at the logs and determine what the task result
was, to avoid this put the result in quotes so that it
is clear in the log message what is the result and what
is not.

Change-Id: I6f9c30e30999dcd8d7f0df26f8066d9f392fe1b9
Merge "Put result in quotes"