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/pdf/PDFAbstractLM.java
{
		PDFStackingLM lm = parent;
		while ( lm != null && !( lm instanceof IPDFTableLayoutManager ) )
		{
			lm = lm.getParent( );
		}
		if ( lm == null )
		{
			assert ( false );
		}
		return (IPDFTableLayoutManager) lm;
	}
	private void resolveBoxConflict( int[] vs, int max )
	{
		int vTotal = 0;
		for ( int i = 0; i < vs.length; i++ )
		{
			vTotal += vs[i];
		}
		resolveConflict( vs, max, vTotal, 0 );
	}
	private void resolveConflict( int[] values, int maxTotal, int total,
			int start )
	{
		int length = values.length - start;
		if ( length == 0 )
		{
			return;
		}
		assert ( length > 0 );