Don't crash when the idb companion isn't available
Don't crash when the idb companion isn't available

Reviewed By: ArthurHub

Differential Revision: D19159086

fbshipit-source-id: fe277c27044c27ab2c45f1b57bfd1b6c6d64c1d9

facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl