There is some problem with checking the procedure name field for null or empty. TD shows error even when there is some name defined.

Steps to reproduce:

1. Select File -> Import -> Web Service Source >> Source and View model(REST)
2. Select some "REST Web Service Source"
3. Type in some "New View Procedure Name"
4. Reselect "REST Web Service Source"
5. In the Procedure name field is still the name that you typed in step 3, but TD shows error that it is null or empty. Even when you retype it, the error still occurs.