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
*  Actuate Corporation  - initial API and implementation
 *******************************************************************************/
package org.eclipse.birt.report.designer.internal.ui.extension;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import org.eclipse.birt.report.designer.internal.ui.util.ExceptionHandler;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.jface.util.Assert;
/**
 * The ExtensionPoinyManager is utility class to retrieve IExtendedElementUI
 * extensions by model extension ID, or full list.It caches the information to
 * avoid reading the extensions each time.
 */
public class EditorContributorManager implements IExtensionConstants
{
	public static class EditorContributor
	{
		public String targetEditorId;
		public List formPageList;
		public boolean merge( EditorContributor contributor )
		{