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/ObjectDefn.java
* @return an iterator over the property definitions.
	 */
	public Iterator getPropertyIterator( )
	{
		List propDefns = new ArrayList( properties.values( ) );
		return ModelUtil.sortPropertiesByLocalizedName( propDefns ).iterator( );
	}
	/**
	 * Returns an iterator over the property definitions. The
	 * <code>PropertyDefn</code> s in the iterator are not sorted.
	 * 
	 * @return an iterator over the property definitions.
	 */
	public Iterator propertiesIterator( )
	{
		return new ArrayList( properties.values( ) ).iterator( );
	}
	/**
	 * Builds information for this definition itself. Called during the build
	 * step.
	 * 
	 * @throws MetaDataException
	 *             if the definition is invalid
	 */
	protected void buildDefn( ) throws MetaDataException
	{
	}
	/**
	 * Set the release in which this object was introduced.
	 *