test_session_harder: Catch exceptions thrown by future.
test_session_harder: Catch exceptions thrown by future.

Change-Id: Ia438f5647a7fe2acab2651220a72c594aa097539

vbarbaresi/libqi,bsautron/libqi,aldebaran/libqi,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi-java,aldebaran/libqi,aldebaran/libqi-java