heck for null sting added

git-svn-id: http://15.206.35.175/svn/proteus/business-java/trunk@190750 ce508802-f39f-4f6c-b175-0d175dae99d5

webitm-dis/ibase/webitm/ejb/dis/PoReturnIC.java

@@ -7045,7 +7045,7 @@ public class PoReturnIC extends ValidatorEJB implements PoReturnICLocal,
 		if (input == null) {
 			input = "";
 		}
-		return input;
+		return chkNull(input);
 	}
 	private String chkNull(String input) {
 		if (input == null || "null".equalsIgnoreCase(input)) {