gdelayedsettingsbackend: Fix applying after calling g_settings_reset()
g_settings_reset() changes the value of the setting to NULL;
add_to_tree() was not handling that correctly.
Add a unit test.
Signed-off-by: Philip Withnall pwithnall@endlessos.org
Fixes: #2426 (closed)
Closes #2426 (closed)
Edited by Philip Withnall