[nhibernate-development] Fix for merge and null components (related to patch for NH 2011)

[Torkel Ödegaard]

Hi,

I discovered a little problem with my patch for issue NH 2011, it occurs
when merging a transient entity with a null component.

I have attached a patch fix.

Cheers
Torkel

Fix_for_Merge_for_null_components.patch
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