ObjectBrowser: Fix minor (theoretical) violation
ObjectBrowser: Fix minor (theoretical) violation

The service.IService interface doesn't provide an enableDebug method, so I
can't rely on it's existence. Oh well.

Signed-off-by: Nicolas Trangez <211e8f2b445c1db9a682e7ce28f88dee1ff08713@eikke.com>

NicolasT/txSpy