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
{
		String exprText;
		Object value;
		/**
		 * 
		 * @param exprText
		 * @param value
		 * @return
		 */
		public static ExprTextAndValue newInstance( String exprText,
				Object value )
		{
			return new ExprTextAndValue( exprText, value );
		}
		/**
		 * 
		 * @param exprText