improvements: newValue is now called if the replacement value is null, allowing to supply new values just by subclassing. ReplaceModel can now be null.
improvements: newValue is now called if the replacement value is null, allowing to supply new values just by subclassing. ReplaceModel can now be null.


git-svn-id: ac804e38dcddf5e42ac850d29d9218b7df6087b7@457509 13f79535-47bb-0310-9956-ffa450edef68

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