Currently a null src field value will always result in
the dest field value being null. Prior to mapping, if
the dest field is already populated or a default value
is specified for the dest field, the dest field will
contain null after mapping if the src field is null.
In most cases it seems reasonable that this is the
correct behavior. But in some cases, it would be
desreable to Not map the null value to the dest
This feature request is to provide a way to explicitly
exclude a field mapping if the src field value is null.
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