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
return IConditionalExpression.OP_BOTTOM_PERCENT;
		if ( modelOpr.equals( DesignChoiceConstants.FILTER_OPERATOR_ANY ) )
			return IConditionalExpression.OP_ANY;
		return IConditionalExpression.OP_NONE;
	}
	protected void addReportDefaultPropertyValue( String name,
			StyleHandle handle )
	{
		addReportDefaultPropertyValue( name, handle, false );
	}
	protected void addReportDefaultPropertyValue( String name,
			StyleHandle handle, boolean isColorProperty )
	{
		Object value = null;
		int index = StylePropertyMapping.getPropertyID( name );
		if ( StylePropertyMapping.canInherit( name ) )
		{
			if ( handle != null )
			{
				if ( isColorProperty )
				{
					value = handle.getColorProperty( name ).getStringValue( );
				}
				else
				{
					value = handle.getProperty( name );
				}
			}
			if ( value == null )
			{