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.setFontFamily( getMemberProperty( highlight,
				HighlightRule.FONT_FAMILY_MEMBER ) );
		style.setColor( getMemberProperty( highlight,
				HighlightRule.COLOR_MEMBER ) );
		style.setFontSize( getMemberProperty( highlight,
				HighlightRule.FONT_SIZE_MEMBER ) );
		style.setFontStyle( getMemberProperty( highlight,
				HighlightRule.FONT_STYLE_MEMBER ) );
		style.setFontWeight( getMemberProperty( highlight,
				HighlightRule.FONT_WEIGHT_MEMBER ) );
		style.setFontVariant( getMemberProperty( highlight,
				HighlightRule.FONT_VARIANT_MEMBER ) );
		
		style.setBorderBottomColor( getMemberProperty( highlight,
				HighlightRule.BORDER_BOTTOM_COLOR_MEMBER ) );
		style.setBorderBottomStyle( getMemberProperty( highlight,
				HighlightRule.BORDER_BOTTOM_STYLE_MEMBER ) );
		style.setBorderBottomWidth( getMemberProperty( highlight,
				HighlightRule.BORDER_BOTTOM_WIDTH_MEMBER ) );
		style.setBorderLeftColor( getMemberProperty( highlight,