Bug 206603 Table column is not rendered in pdf if its width is set in ems
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFAbstractLM.java
if ( content != null )
		{
			IStyle style = content.getComputedStyle( );
			boolean outputDisplayNone = context.getOutputDisplayNone( );
			if ( !outputDisplayNone
					&& IStyle.NONE_VALUE.equals( style
							.getProperty( IStyle.STYLE_DISPLAY ) ) )
			{
				return true;
			}
			return isHiddenByVisibility( );
		}
		return false;
	}
	protected boolean isHiddenByVisibility( )
	{
		if ( content != null )
		{
			IStyle style = content.getComputedStyle( );
			ListValue formats = (ListValue) style
					.getProperty( IStyle.STYLE_VISIBLE_FORMAT );
			if ( formats.getLength( ) == 0 )
			{
				return false;
			}
			else
			{
				String format = context.getFormat( );
				for ( int i = 0; i < formats.getLength( ); i++ )
				{