[patch] raise exceptions when you try to use python bindings without a mainloop

[Robert McQueen]

I've run into this "why don't I get any signals? grr!" and so has
someone on #dbus, so I guess it's worth adding a check. This throws an
exception when you try to bind to a signal and don't have a mainloop
binding like dbus.glib loaded. It might make sense to also error when
you try and make method calls too, not certain.

Regards,
Rob
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