Bug 163018 An error extension will lead the report contain chart can't be opened and can not new a report.
Details: An error extension will lead the report contain chart can't open In org.eclipse.birt.report.tests.model has an error extension. When run the birt use workbenck, the report contain chart can't be opened and it can not new a report.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
* @return list of locally-defined properties.
	 */
	public List getLocalProperties( )
	{
		return new ArrayList( properties.values( ) );
	}
	/**
	 * Returns the properties defined on this element.
	 * 
	 * @return list of properties defined in this element and and all its parent
	 *         elements.
	 */
	public List getProperties( )
	{
		return new ArrayList( cachedProperties.values( ) );
	}
	/**
	 * Gets a property definition given a property name.
	 * 
	 * @param propName
	 *            The name of the property to get.
	 * @return The property with that name, or null if the property cannot be
	 *         found.
	 */
	public IElementPropertyDefn getProperty( String propName )
	{
		assert propName != null;
		return (ElementPropertyDefn) cachedProperties.get( propName );
	}
	/**