Views data should be included in hook_init()

simplenews.views.inc is currently included in hook_menu().
There's a known erratic race condition where the exposed data is missing when views requires it.

See http://drupal.org/node/189311 for a similar issue that got fixed in VotingAPI.
CCK, OG have been doing this for more than a year now, VotingAPI got fixed a few months ago too, so I'm setting directly as RTBC :-)

function simplenews_init() {
  // only bother when we are not serving a cached page. check for which function that only exists afterwards
  if (function_exists('drupal_set_content')) {
    if (module_exists('views')) {
      include_once(drupal_get_path('module', 'votingapi') .'/votingapi_views.inc');     
    }
  }
}