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A special case is when we can't find the AttributeType in the schema. They are three cases where it can happen :
- the entry is a referral (ie the referral OC is present into this entry)
- the entry has the extensible ObjectClass
- we are facing an error
In the two first cases, we won't be able to do a prepSTring nor a normalization as we don't know if the AttributeType is H/R or not, and we don't know either anything about the normalizer. We will simply track the fact that the AttributeType is unknown by not attaching a reference to the associated AttributeType object (for ServerDNs) and by not filling the normalized form for the AVA (keeping it null: an empty tring won't be enough, as we may have empty values after normalization - a very weird and twisted posibility, but ...-).
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