Event handler called when the RHS of #set is null. Lets an app approve / veto
writing a log message based on the specific reference.
author: Will Glass-Husain author: Geir Magnusson Jr. version: $Id: NullSetEventHandler.java 470256 2006-11-02 07:20:36Z wglass $
Called when the RHS of a #set() is null, which will result
in a null LHS. All NullSetEventHandlers
are called in sequence until a false is returned. If no NullSetEventHandler
is registered all nulls will be logged.
Parameters: lhs - reference literal of left-hand-side of set statement Parameters: rhs - reference literal of right-hand-side of set statement true if log message should be written, false otherwise