device-mapper: Fix a crash when setting display
The details can be NULL. So guard against dereferencing NULL pointers by setting the default value.
Closes: https://source.puri.sm/Librem5/gnome-settings-daemon/issues/4
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The details can be NULL. So guard against dereferencing NULL pointers by setting the default value.
Closes: https://source.puri.sm/Librem5/gnome-settings-daemon/issues/4