[ESME-292] Implement API2 methods for Tag/Conversation follow/unfollow

fixed unfollow tag

git-svn-id: https://svn.apache.org/repos/asf/esme/branches/api2-1.3@1150126 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/server/src/main/scala/org/apache/esme/api/API2.scala b/server/src/main/scala/org/apache/esme/api/API2.scala
index cbd27cb..0f01eb4 100644
--- a/server/src/main/scala/org/apache/esme/api/API2.scala
+++ b/server/src/main/scala/org/apache/esme/api/API2.scala
@@ -814,7 +814,7 @@
         val messages = Message.findMessages(List(id)) 

         

          val m = messages.values.toList.head

-         if (!m.followers.contains(user)) { 

+         if (m.followers.contains(user)) { 

             m.followers -= user

             m.save       

         }