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
*/
	void doLoad( ) throws ExtensionException, MetaDataException
	{
		IExtensionRegistry pluginRegistry = Platform.getExtensionRegistry( );
		if ( pluginRegistry == null )
		{
			throw new ExtensionException(
					new String[]{extensionPointer},
					ExtensionException.DESIGN_EXCEPTION_EXTENSION_POINT_NOT_FOUND );
		}
		IExtensionPoint extensionPoint = pluginRegistry
				.getExtensionPoint( extensionPointer );
		if ( extensionPoint == null )
			throw new ExtensionException(
					new String[]{extensionPointer},
					ExtensionException.DESIGN_EXCEPTION_EXTENSION_POINT_NOT_FOUND );
		IExtension[] extensions = extensionPoint.getExtensions( );
		if ( extensions != null )
		{
			for ( int i = 0; i < extensions.length; i++ )
			{
				loadExtension( extensions[i] );
			}
		}
	}
	/**
	 * Represents the loader which loads the top level XML element in extension
	 * definition file. The common constants are defined for parsing.
	 */
	abstract class ExtensionElementLoader