future: add missing returns
future: add missing returns

Change-Id: Ice9210d7ba961fafc0403278ca8708cb2997c4a9

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