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If both $XDG_CONFIG_HOME and $HOME are unset, we'd try to copy a NULL
string, causing a crash. This is the environment systemd provides to
its daemons, and that was causing upowerd to crash.
http://libiphone.lighthouseapp.com/projects/27916-libiphone/tickets/273-patch-fix-segfault-when-running-with-home-unset#ticket-273-2
http://libiphone.lighthouseapp.com/projects/27916/tickets/265-userpref_get_config_dir-segfaults-when-home-is-undefined
https://bugzilla.redhat.com/show_bug.cgi?id=834359
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