Bug 121687 Exception throws when export data in table which inside a grid cell.
Description: Exception throws when export data in table which inside a grid cell. Steps to reproduce: 1. insert a grid. 2. insert one table to one grid cell. 3. insert another table to the other grid cell. 4. export data in two tables. Expected result: Data are exported. Actual result: Exception in: ReportEngineService.getMetaData( )
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
style
				.setFontStyle( getElementProperty( handle,
						Style.FONT_STYLE_PROP ) );
		style
				.setFontWeight( getElementProperty( handle,
						Style.FONT_WEIGHT_PROP ) );
		style.setFontVariant( getElementProperty( handle,
				Style.FONT_VARIANT_PROP ) );
		
		style.setBorderBottomColor( getElementProperty( handle,
				Style.BORDER_BOTTOM_COLOR_PROP, true ) );
		style.setBorderBottomStyle( getElementProperty( handle,
				Style.BORDER_BOTTOM_STYLE_PROP ) );
		style.setBorderBottomWidth( getElementProperty( handle,
				Style.BORDER_BOTTOM_WIDTH_PROP ) );
		style.setBorderLeftColor( getElementProperty( handle,
				Style.BORDER_LEFT_COLOR_PROP, true ) );
		style.setBorderLeftStyle( getElementProperty( handle,
				Style.BORDER_LEFT_STYLE_PROP ) );
		style.setBorderLeftWidth( getElementProperty( handle,
				Style.BORDER_LEFT_WIDTH_PROP ) );
		style.setBorderRightColor( getElementProperty( handle,
				Style.BORDER_RIGHT_COLOR_PROP, true ) );
		style.setBorderRightStyle( getElementProperty( handle,
				Style.BORDER_RIGHT_STYLE_PROP ) );
		style.setBorderRightWidth( getElementProperty( handle,
				Style.BORDER_RIGHT_WIDTH_PROP ) );
		style.setBorderTopColor( getElementProperty( handle,
				Style.BORDER_TOP_COLOR_PROP, true ) );
		style.setBorderTopStyle( getElementProperty( handle,