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
}
			
			
			return obArray;
		}
		/**
		 * 
		 * @param obArray
		 * @throws BirtException 
		 */
		private static void makeObjectArrayStringArray( Object[] obArray ) throws BirtException
		{
			for ( int i = 0; i < obArray.length; i++ )
			{
				if ( obArray[i] != null )
					obArray[i] = DataTypeUtil.toString( obArray[i] );
			}
		}
		
		/**
		 * @param ise
		 * @return
		 */
		private static IScriptExpression constructValidScriptExpression ( IScriptExpression ise)
		{
		    return ise!=null && ise.getText().trim().length() > 0 ? ise : new ScriptExpression("null");
		}		
	}
}