Bug 191168 [Regression]Exception occurs when resize masterpage in library
Description: Exception occurs when resize masterpage in library. Build number:2.2.0.v20070606-0630 Regression bug:187443 Steps to reproduce: 1. New a library. 2. Go to Master Page, resize the master page using the ruler. Expected result: 1. Layout works correctly. 2. No exception is thrown out. Error log: An unexpected internal exception occurred.Please see log for detail. Plug-in Provider:Eclipse.org Plug-in Name:BIRT Designer UI Plug-in ID:org.eclipse.birt.report.designer.ui Version:2.2.0.v20070606-0630 Error Code:Error.GUIException.invokedByUnexpectedException Error Message:org.eclipse.birt.report.designer.internal.lib.lalyout.LibraryReportDesignLayout
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/Module.java
*         return null.
	 * 
	 * @see IModuleNameScope#resolve(String, PropertyDefn)
	 */
	public DesignElement resolveElement( DesignElement element,
			PropertyDefn propDefn, IElementDefn elementDefn )
	{
		ElementRefValue refValue = nameHelper.resolve( element, propDefn,
				elementDefn );
		return refValue == null ? null : refValue.getElement( );
	}
	/**
	 * Resolves element with the given element name and name space.
	 * 
	 * @param elementName
	 *            name of the element
	 * @param nameSpace
	 *            name space
	 * @return the resolved element if the name can be resolved, otherwise,
	 *         return null.
	 */
	private DesignElement resolveNativeElement( String elementName,
			int nameSpace )
	{
		NameSpace namespace = nameHelper.getNameSpace( nameSpace );
		return namespace.getElement( elementName );
	}
	/**
	 * Sets the exceltion list into this module.
	 *