[LMS-1264] empty map bug

SVN: 13509

deep_sequencing_unit/source/java/ch/ethz/bsse/cisd/dsu/tracking/email/EntityTrackingEmailDataManager.java

@@ -112,6 +112,7 @@ class EntityTrackingEmailDataManager
         if (emailDataOrNull == null)
         {
             emailDataOrNull = new EntityTrackingEmailData(recipient);
+            dataByRecipient.put(recipient, emailDataOrNull);
         }
         return emailDataOrNull;
     }