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
final public int getLineNoByID( long id )
	{
		if ( lineNoInfo == null )
			return 1;
		return lineNoInfo.getElementLineNo( id );
	}
	/**
	 * Adds an object's line number info.
	 * 
	 * @param obj
	 *            the object
	 * @param lineNo
	 *            the line number
	 */
	public void addLineNo( Object obj, Integer lineNo )
	{
		if ( lineNoInfo == null )
			return;
		lineNoInfo.put( obj, lineNo );
	}
	/**
	 * Returns the undo/redo stack for this module.
	 * 
	 * @return The "command" stack.
	 */
	public ActivityStack getActivityStack( )
	{
		return activityStack;
	}
	/**