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
.findMasterPage( newMasterPage );
				if ( masterPageDesign != null )
				{
					context.setMasterPage( newMasterPage );
					return true;
				}
			}
		}
		return false;
	}
	protected MasterPageDesign getMasterPage( IReportContent report )
	{
		String masterPage = context.getMasterPage( );
		MasterPageDesign pageDesign = null;
		if ( masterPage != null && !"".equals( masterPage ) ) 
		{
			pageDesign = report.getDesign( ).findMasterPage( masterPage );
			if ( pageDesign != null )
			{
				return pageDesign;
			}
		}
		return getDefaultMasterPage( report );
	}
	private MasterPageDesign getDefaultMasterPage( IReportContent report )
	{
		PageSetupDesign pageSetup = report.getDesign( ).getPageSetup( );
		int pageCount = pageSetup.getMasterPageCount( );
		if ( pageCount > 0 )
		{