Throw error when name is not set: `TypeError: Cannot read properties of undefined (reading 'split')`

[johnwei005]

Example

--ecbb66dd-44d6-4a21-98de-896ec2f6fd2a
Content-Disposition: form-data

<ACORD><Status>Success</Status><StatusDesc>Please find the quote/policy documents attached as per your request</StatusDesc></ACORD>
--ecbb66dd-44d6-4a21-98de-896ec2f6fd2a
Content-Disposition: form-data; filename="test1.pdf"; name="test.pdf"
Content-Type: application/pdf

xxxx pdf xxxx

--ecbb66dd-44d6-4a21-98de-896ec2f6fd2a--

Expected

Do not throw error, just ignore the parts that missing name, or add a default name for the case.