Bug 151202 [regression]Set default master page to item in cell will cause blank page
Description: Set default master page to item in cell will cause blank page Steps to reproduce: 1. New a report 2. Insert a grid(1*1) 3. Insert a label to grid cell 4. Select the label and set default master page to it 5. Preview in Web Viewer and pdf Expected result: No blank page, just one page for grid display. Actual result: A blank page before grid page
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLAbstractLM.java
this.parent = parent;
		this.content = content;
		this.executor = executor;
		this.emitter = emitter;
		status = STATUS_INTIALIZE;
	}
	public HTMLAbstractLM getParent( )
	{
		return parent;
	}
	/**
	 * output the content.
	 */
	protected void start( )
	{
		if ( emitter != null )
		{
			ContentEmitterUtil.startContent( content, emitter );
		}
	}
	/**
	 * end output the content
	 */
	protected void end( )
	{
		if ( emitter != null )
		{
			ContentEmitterUtil.endContent( content, emitter );
		}
	}