Bug 148515 [Regression] User properties can't be found in properties view(chart)
[Regression] User properties can't be found in properties view(chart) Steps: 1.Create a chart 2.Open property editor view, select User Porperties, add "abc" string 3.Open properties view Actual Results: 1.user properties are not displayed. Expected Resulst:L 1.user properties should be displayed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/extension/ExtensibilityProvider.java
* Constructs the extensibility provider with the extendable element and the
	 * extension name.
	 * 
	 * @param element
	 *            the extendable element
	 */
	public ExtensibilityProvider( DesignElement element )
	{
		this.element = element;
	}
	/**
	 * Returns the read-only list of all property definitions, including those
	 * defined in Model and extension definition file. The returned list is
	 * read-only, so no modification is allowed on this list. Each one in list
	 * is the instance of <code>IPropertyDefn</code>.
	 * 
	 * @return the read-only list of all property definitions. Return empty list
	 *         if there is no property defined.
	 */
	public List getPropertyDefns( )
	{
		ExtensionElementDefn extDefn = getExtDefn( );
		
		
		if ( extDefn != null && extDefn.getProperties( ) != null )
		{
			return extDefn.getProperties( );
		}
		return Collections.EMPTY_LIST;
	}