This adds a test for JComponent.putClientProperty() that tests if an
event should be fired, when a property that is null has
putClientProperty() called with null. No event should be fired in that
case. This is different from the behaviour of PropertyChangeSupport
which fires an event in that case. I also added a testcase for this.

2006-11-28  Roman Kennke <kennke@aicas.com>

	* gnu/testlet/java/beans/PropertyChangeSupport/firePropertyChange.java:
	New test.
	* gnu/testlet/javax/swing/JComponent/putClientProperty.java:
	Added check for how setting a null property fires an event or
	not.

/Roman