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connectSession throws a ClientError Exception when
DBUS_SESSION_BUS_ADDRESS is unset. Without exception handler this will
result in program termination.
Since the DBus handler merely sends a signal to the event loop it does
no harm when it won't run. Normal operation will continue just if
compiled without dbus support.
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This belongs here, otherwise ghc will complain about orphaned instances
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safeHead is a very general utility function with suits better into a
common Util module.
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