Bug 132506 [Regression][Linux WS]Error on operation buttom in layout tab
Details: [Regression]Error on operation buttom in layout tab Setp: When I new a report design or template, it will be appear on preview state, but layout state.
UI/org.eclipse.birt.report.designer.ui.editors/src/org/eclipse/birt/report/designer/internal/ui/extension/EditorContributorManager.java
* Gets the list of all the extended element points.
	 * 
	 * @return Returns the list of all the extended element point
	 *         (ExtendedElementUIPoint).
	 */
	public EditorContributor[] getEditorContributors( )
	{
		synchronized ( this )
		{
			if ( editorContributorMap == null )
			{
				createEditorContributorMap( );
				if ( editorContributorMap == null )
				{
					return null;
				}
			}
		}
		return (EditorContributor[]) editorContributorMap.values( )
				.toArray( new EditorContributor[editorContributorMap.size( )] );
	}
	public EditorContributor getEditorContributor( String targetEditorId )
	{
		Assert.isLegal( targetEditorId != null );
		synchronized ( this )
		{
			if ( editorContributorMap == null )
			{
				createEditorContributorMap( );
				if ( editorContributorMap == null )