Bug 193886 NPE is thrown when preview external CSS style in ppt[1205]
engine/org.eclipse.birt.report.engine.emitter.ppt/src/org/eclipse/birt/report/engine/emitter/ppt/PPTRender.java
|| borderBottomWidth > 0
					|| borderRightWidth > 0 )
			{
				
				Color borderTopColor = PropertyUtil.getColor( style.getProperty( StyleConstants.STYLE_BORDER_TOP_COLOR ) );
				Color borderRightColor = PropertyUtil.getColor( style.getProperty( StyleConstants.STYLE_BORDER_RIGHT_COLOR ) );
				Color borderBottomColor = PropertyUtil.getColor( style.getProperty( StyleConstants.STYLE_BORDER_BOTTOM_COLOR ) );
				Color borderLeftColor = PropertyUtil.getColor( style.getProperty( StyleConstants.STYLE_BORDER_LEFT_COLOR ) );
				
				BorderInfo[] borders = new BorderInfo[4];
				borders[BorderInfo.TOP_BORDER] = new BorderInfo( layoutX,
						layoutY + borderTopWidth / 2,
						layoutX + container.getWidth( ),
						layoutY + borderTopWidth / 2,
						borderTopWidth,
						borderTopColor,
						style.getProperty( StyleConstants.STYLE_BORDER_TOP_STYLE ),
						BorderInfo.TOP_BORDER );
				borders[BorderInfo.RIGHT_BORDER] = new BorderInfo( layoutX
						+ container.getWidth( )
						- borderRightWidth
						/ 2,
						layoutY,
						layoutX + container.getWidth( ) - borderRightWidth / 2,
						layoutY + container.getHeight( ),
						borderRightWidth,
						borderRightColor,
						style.getProperty( StyleConstants.STYLE_BORDER_RIGHT_STYLE ),
						BorderInfo.RIGHT_BORDER );
				borders[BorderInfo.BOTTOM_BORDER] = new BorderInfo( layoutX,