[gnome-boxes/gnome-3-36] (10 commits) ...Release 3.36.2

[Felipe Borges <felipeborges src gnome org>]

Summary of changes:

  892d605... Fix crash on creating a new box (*)
  eb999ea... util-app: Don't warn when OS is not found in osinfo-db (*)
  a0d5aff... downloads-hub: Don't do anything after a download is cancel (*)
  d1b3602... media-manager: Don't warn when Tracker can't find an ISO (*)
  df9e0e7... downloads-hub: Don't dismiss a row until the download is co (*)
  f5ef40a... machine: Only clear the keyring for existing machines (*)
  d518dcc... machine: Only dismiss existing notifications (*)
  f14a05e... notification: Keep track of source IDs (*)
  d74f61c... util-app: Account for Medias without URLs in serilize_os_ti (*)
  b317aa5... Release 3.36.2 (*)

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