[gtorrentviewer/f20] (4 commits) ...Avoid segfault when dealing with torrent that has no tracker (#1178062)

[Paul Howarth]

Summary of changes:

  58b6404... Add missing format strings in g_warning() invocations (*)
  531f87e... - Rebuilt for https://fedoraproject.org/wiki/Fedora_21_Mass (*)
  a4ed851... - Rebuilt for https://fedoraproject.org/wiki/Fedora_21_22_M (*)
  d175051... Avoid segfault when dealing with torrent that has no tracke (*)

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