[gnome-shell] (5 commits) ...layoutManager: Return null monitor if focusIndex is invalid

[Jonas Ådahl <jadahl src gnome org>]

Summary of changes:

  c9bf72c... windowMenu: Check if monitorIndex is valid before using it (*)
  19e864e... keyboard: Handle case where keyboardMonitor is unset (*)
  84d2d3f... keyboard: Check monitor validity before deferencing it (*)
  8789469... windowManager: Don't animate unmanaged windows on (un)minim (*)
  996dd74... layoutManager: Return null monitor if focusIndex is invalid (*)

(*) This commit already existed in another branch; no separate mail sent