code: function filterNoticesBy( site, pluginSlug, log ) {
  	if ( ! site && ! pluginSlug ) {
  		return true;
  	}
  	if ( isSameSiteNotice( site, log ) && isSamePluginNotice( pluginSlug, log ) ) {
  		return true;
  	} else if ( ! pluginSlug && isSameSiteNotice( site, log ) ) {
  		return true;
  	} else if ( ! site && isSamePluginNotice( pluginSlug, log ) ) {
  		return true;
  	}
  	return false;
  }
docs: Filter function that return notices that fit a certain criteria.
  
  @param  {Object} site       Site Object
  @param  {String} pluginSlug Plugin Slug
  @param  {Object} log        Notice log Object
  @return {Bool} True if notice matches criteria