[gnome-boxes] (8 commits) Non-fast-forward update to branch shut-build-warnings

[Felipe Borges <felipeborges src gnome org>]

The branch 'shut-build-warnings' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  e3f31c7... review-page: Drop unused function
  2394cfd... vm-configurator: Drop unused "graphics" variable
  33f5eec... assistant: Implicit .begin is deprecated
  5109e96... Fix various accesses to possible `null' variables
  6c29a7d... Handle thrown exceptions in various places
  6a3c801... libvirt-machine-properties: Drop unreachable catch clause

Commits added to the branch:

  43e0d65... Revert "display-page: Center the DnD transfer message in an (*)
  ab7b7e8... display-page: Center the DnD transfer message in an overlay (*)
  f2835e2... review-page: Drop unused function
  c31f88e... vm-configurator: Drop unused "graphics" variable
  84649b0... assistant: Implicit .begin is deprecated
  ed323cb... Fix various accesses to possible `null' variables
  40257b0... Handle thrown exceptions in various places
  05ed13f... libvirt-machine-properties: Drop unreachable catch clause

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