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/ExtensionLoader.java
{
		this.extensionPointer = extensionPointer;
	}
	abstract void loadExtension( IExtension extension )
			throws ExtensionException, MetaDataException;
	/**
	 * Loads the extensions in plug-ins, and add them into metadata dictionary.
	 * 
	 * @throws MetaDataParserException
	 *             if error is found when loading extension.
	 */
	public void load( ) throws MetaDataParserException
	{
		try
		{
			doLoad( );
			
			List extensions = MetaDataDictionary.getInstance( ).getExtensions( );
			if ( extensions == null || extensions.isEmpty( ) )
				return;
			for ( int i = 0; i < extensions.size( ); i++ )
			{
				ElementDefn defn = (ElementDefn) extensions.get( i );
				defn.build( );
			}
		}
		catch ( ExtensionException e )
		{
			logExtenstionException( e );
			throw new MetaDataParserException( e,