Pre-conditions

Reproduction steps

no reproduction steps has been found yet
It seems to be an unexpected request from ios devices, they try to fetch the attachment "191AF69B-0088-47D2-AD66-6C9D08949C46" which does not exist.
You can search for this UUID on the web, multiple activesync servers encounter this same issue.

Current behavior

1. NOK A NPE error is printed in logs

   09:52:23.803 [ERROR] {o.o.a.t.TransactionalInterceptor} [t1252082/cGetAttachment/r1253280/user@linagora.com] transaction was rollback
   java.lang.NullPointerException: null
   	at org.obm.push.mail.MailBackendImpl.getAttachment(MailBackendImpl.java:751) ~[push-mail-3.1.1-beta1.jar:na]
   	at org.obm.breakdownduration.BreakdownDurationInterceptor.invoke(BreakdownDurationInterceptor.java:58) ~[breakdown-duration-3.1.2.jar:na]
   	at org.obm.push.handler.GetAttachmentHandler.getAttachment(GetAttachmentHandler.java:88) ~[push-core-3.1.1-beta1.jar:na]
   	at org.obm.push.handler.GetAttachmentHandler.process(GetAttachmentHandler.java:70) ~[push-core-3.1.1-beta1.jar:na]
   	at org.obm.push.ActiveSyncServlet.processActiveSyncMethod(ActiveSyncServlet.java:258) ~[push-core-3.1.1-beta1.jar:na]
   	at org.obm.push.ActiveSyncServlet.doPost(ActiveSyncServlet.java:174) ~[push-core-3.1.1-beta1.jar:na]
   	at org.obm.annotations.transactional.TransactionalInterceptor.managerTransaction(TransactionalInterceptor.java:87) ~[annotations-
   

Expected behavior

1. OK No more NPE error

Additional informations