Bug 201030 NPE throws out when preview the attached report design
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java
{
			case IConditionalExpression.OP_EQ :
			    result = compare( resultObject, resultOp[0] ) == 0;
				break;
			case IConditionalExpression.OP_NE :
			    result = compare( resultObject, resultOp[0] ) != 0;
				break;
			case IConditionalExpression.OP_LT :
				result = compare( resultObject, resultOp[0] ) < 0;
				break;
			case IConditionalExpression.OP_LE :
				result = compare( resultObject, resultOp[0] ) <= 0;
				break;
			case IConditionalExpression.OP_GE :
				result = compare( resultObject, resultOp[0] ) >= 0;
				break;
			case IConditionalExpression.OP_GT :
				result = compare( resultObject, resultOp[0] ) > 0;
				break;
			case IConditionalExpression.OP_BETWEEN :
				result = between( resultObject, resultOp[0], resultOp[1] );
				break;
			case IConditionalExpression.OP_NOT_BETWEEN :
				result = !( between( resultObject, resultOp[0], resultOp[1] ) );
				break;
			case IConditionalExpression.OP_NULL :
				result = resultObject == null;
				break;
			case IConditionalExpression.OP_NOT_NULL :
				result = resultObject != null;