Warning Banner still appear after attaching the right File on the request form.

Summary:

If we attach an empty text file on the Request form, a Warning Banner will appear. But, the warning did not disappear even when the right file is attached on the request.

Steps to Reproduce:

1. Create a Service Desk project.
2. Add the "Attachment" field on one of the Request Type.
   Service Desk Project Administration > Request Types > select the Request > Edit fields
3. Navigate to the Customer Portal and select the request type
4. Create an Empty Text File and select it on the form.
5. A warning will appears.
6. Attach another Text File that is not empty.

Expected Result:

• The warning will disappear and the file is attached.

Actual Result:

• The file is attached and the warning still appears.

Notes:

• If the warning did not disappear, at least it should behave like it will automatically disappear even though there is no file attached yet.