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
{
			PropertyDefn propDefn = (PropertyDefn) iter.next( );
			if ( propDefn.getTypeCode( ) == type )
			{
				props.add( propDefn );
			}
		}
		return props;
	}
	/**
	 * Caches meta-data for this element. Resolves the parent name and so on.
	 * 
	 * @throws MetaDataException
	 *             if any build process failed.
	 * 
	 */
	protected void build( ) throws MetaDataException
	{
		if ( isBuilt )
			return;
		buildDefn( );
		buildProperties( );
		
		
		if ( !isAbstract( ) )
		{
			checkJavaClass( );
			checkXmlName( );
		}
		checkPropertyVisibilities( );