[gnome-boxes] (10 commits) ...util-app: Account for Medias without URLs in serilize_os_title

[Felipe Borges <felipeborges src gnome org>]

Summary of changes:

  9270839... util-app: Don't warn when OS is not found in osinfo-db (*)
  3dceeff... review-page: Not all properties are valid for a given OS (*)
  982382b... remote-connection, assistant: Don't set entry URI when uri  (*)
  89b507d... downloads-hub: Don't do anything after a download is cancel (*)
  61a93c3... media-manager: Don't warn when Tracker can't find an ISO (*)
  5a86d26... downloads-hub: Don't dismiss a row until the download is co (*)
  95e939c... machine: Only clear the keyring for existing machines (*)
  47f35bb... machine: Only dismiss existing notifications (*)
  a1be772... notification: Keep track of source IDs (*)
  1a84040... util-app: Account for Medias without URLs in serilize_os_ti (*)

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