net-wireless/blueman-9999 needs dev-python/pygobject-3*, but currently its ebuild is not depending on it. When this package is missing, blueman-applet cannot be started and fails with "python: no module named gi found" Reproducible: Always
The Problem is, that the ebuild check agains dev-python/pygobject-2 or dev-python/pygobject-3. But if you have pulled dev-python/pygobject-2 because of depencies and using python 3.x, that will fail. If you are using python 3.x, dev-python/pygobject-3 must be used.
Fixed long ago.