emsmdb/oxcfxics: Don't abort when we get a 'not yet seen' idset

We should find what to do in such situation, but aborting here
doesn't look good for end users.

Signed-off-by: Kamen Mazdrashki <kamenim@samba.org>
Merge pull request #33 from Zentyal/kamenim/zs-32-dont-abort-when-we-get-unrecognzed-idset

emsmdb/oxcfxics: Don't abort when we get a 'not yet seen' idset