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
value = StylePropertyMapping.getDefaultValue( name );
			}
			inheritableReportStyle.setCssText( index, value == null
					? null
					: value.toString( ) );
		}
		else
		{
			value = StylePropertyMapping.getDefaultValue( name );
			nonInheritableReportStyle.setCssText( index, value == null
					? null
					: value.toString( ) );
		}
	}
	/**
	 * Creates Report default styles
	 */
	protected void createReportDefaultStyles( StyleHandle handle )
	{
		nonInheritableReportStyle = new StyleDeclaration( cssEngine );
		inheritableReportStyle = new StyleDeclaration( cssEngine );
		
		addReportDefaultPropertyValue( Style.BACKGROUND_COLOR_PROP, handle,
				true );
		addReportDefaultPropertyValue( Style.BACKGROUND_IMAGE_PROP, handle );
		addReportDefaultPropertyValue( Style.BACKGROUND_POSITION_X_PROP, handle );
		addReportDefaultPropertyValue( Style.BACKGROUND_POSITION_Y_PROP, handle );
		addReportDefaultPropertyValue( Style.BACKGROUND_REPEAT_PROP, handle );
		
		addReportDefaultPropertyValue( Style.TEXT_ALIGN_PROP, handle );