in src/main/scala/com/gu/mobile/content/notifications/lib/ContentAlertPayloadBuilder.scala [76:82]
private def getTopicType(tagType: TagType): Option[TopicType] = tagType match {
case TagType.Contributor => Some(TagContributor)
case TagType.Keyword => Some(TagKeyword)
case TagType.Series => Some(TagSeries)
case TagType.Blog => Some(TagBlog)
case _ => None
}