5f8a511483
We were handling being initially headless by only setting the primary and bottom monitor if there was any primary monitor, then checking the primary monitor reference before making calls assuming there was any monitors. What we didn't do was unset the primary and bottom monitor when going headless, meaning that temporarly disconnecting a monitor while having windows open caused an assert to be triggered due to various code paths taking the path assuming there are valid monitors. Unsetting both the primary and bottom monitor when going headless avoids the code paths in the same way as they were avoided when starting headless. https://bugzilla.gnome.org/show_bug.cgi?id=788607
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