tor/changes/bug-15642-default-fallback-default-dirs

  o Minor bugfixes (configuration):
    - Only add the default fallback directories when the DirAuthorities,
      AlternateDirAuthority, and FallbackDir directory config options
      are set to their defaults.
      The default fallback directory list is empty, this fix will only
      change tor's behaviour when it has default fallback directories.
      Fixes bug 15642; bugfix on 90f6071d8dc0 in 0.2.4.7-alpha.
      Patch by "teor".