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
protected StyleDeclaration createPrivateStyle( ReportElementHandle handle )
	{
		
		StyleDeclaration style = new StyleDeclaration( cssEngine );
		style.setBackgroundColor( getElementProperty( handle,
				Style.BACKGROUND_COLOR_PROP, true ) );
		style.setBackgroundImage( getElementProperty( handle,
				Style.BACKGROUND_IMAGE_PROP ) );
		style.setBackgroundPositionX( getElementProperty( handle,
				Style.BACKGROUND_POSITION_X_PROP ) );
		style.setBackgroundPositionY( getElementProperty( handle,
				Style.BACKGROUND_POSITION_Y_PROP ) );
		style.setBackgroundRepeat( getElementProperty( handle,
				Style.BACKGROUND_REPEAT_PROP ) );
		
		style
				.setTextAlign( getElementProperty( handle,
						Style.TEXT_ALIGN_PROP ) );
		style
				.setTextIndent( getElementProperty( handle,
						Style.TEXT_INDENT_PROP ) );
		style.setTextUnderline( getElementProperty( handle,
				Style.TEXT_UNDERLINE_PROP ) );
		style.setTextLineThrough( getElementProperty( handle,
				Style.TEXT_LINE_THROUGH_PROP ) );
		style.setTextOverline( getElementProperty( handle,
				Style.TEXT_OVERLINE_PROP ) );
		style.setLetterSpacing( getElementProperty( handle,
				Style.LETTER_SPACING_PROP ) );
		style