fix notification adding error

The test on whether the user notification queue existed or not was just wrong.

ChangeLog.rst

@@ -1,6 +1,8 @@
 Dev
 ***
 
+* [fix ] notifications missing in case of multiple notification waiting to be displayed
+
 Version 0.2.2
 *************
 

ldapcherry/__init__.py

@@ -431,7 +431,7 @@ class LdapCherry(object):
         """
         sess = cherrypy.session
         username = sess.get(SESSION_KEY, None)
-        if username is not self.notifications:
+        if username not in self.notifications:
             self.notifications[username] = []
         self.notifications[username].append(message)