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
+ bi.borderWidth
										/ 2
										- innerBorderWidth
										/ 2 ),
								layoutPointX2PPT( bi.endX
										- 3
										* borders[BorderInfo.RIGHT_BORDER].borderWidth
										/ 4 ),
								layoutPointY2PPT( bi.endY
										+ bi.borderWidth
										/ 2
										- innerBorderWidth
										/ 2 ),
								pptMeasure( innerBorderWidth ),
								bi.borderColor,
								"solid" ); 
						break;
					case BorderInfo.RIGHT_BORDER :
						drawLine( layoutPointX2PPT( bi.startX
								+ bi.borderWidth
								/ 2
								- outerBorderWidth
								/ 2 ),
								layoutPointY2PPT( bi.startY ),
								layoutPointX2PPT( bi.endX
										+ bi.borderWidth
										/ 2
										- outerBorderWidth
										/ 2 ),
								layoutPointY2PPT( bi.endY ),