[PATCH] better deal with pushing empty strings in fix sized char arrays in pidl

[Günther Deschner]

Hi,

attached a patch to avoid crashing when trying to push a NULL string
into a fixed size string buffer.

From discussions with metze I know that there are more cases where we
currently run into crashing.

Please review and push.

Thanks,
Guenther
-- 
Günther Deschner                    GPG-ID: 8EE11688
Red Hat                         gdeschner at redhat.com
Samba Team                              gd at samba.org
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