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
protected boolean isBuilt = false;
	/**
	 * The predefined style, if any, for this element. The style name is the
	 * internal name.
	 */
	protected String selector = null;
	/**
	 * Whether this element allows the definition of user-defined properties. If
	 * a given element does not allow user-properties, then none of its derived
	 * elements supports them either.
	 */
	protected boolean supportsUserProperties = true;
	/**
	 * List of style properties that apply to this element. Only those
	 * properties listed here are available to this element. Contents are
	 * strings.
	 */
	protected ArrayList stylePropertyNames = null;
	/**
	 * Indicates the name space in which instances of this element reside.
	 */
	protected int nameSpaceID = MetaDataConstants.NO_NAME_SPACE;
	/**
	 * Name option: one of following defined in MetaDataConstants:
	 * {@link MetaDataConstants#NO_NAME NO_NAME},
	 * {@link MetaDataConstants#OPTIONAL_NAME OPTIONAL_NAME}, or
	 * {@link MetaDataConstants#REQUIRED_NAME REQUIRED_NAME}.
	 */
	protected int nameOption = MetaDataConstants.OPTIONAL_NAME;
	/**