Chunked upload fails to validate upload of some mimetypes because blob.type is empty.

[alexsilva]

Describe the bug
Chunked upload fails to validate upload of some mimetypes because blob.type is empty #L7032.

The file in question is the DebianGNULinux_1-1-3-0_x64.Appx com o mimetype application/zip

Even without knowing the mimetype, sending occurs normally but the backend and client are configured to deny the application mimetype.

The backend validates the file and returns an error message {'error': "mesage"}

To Reproduce
Steps to reproduce the behavior:

1. configure uploadDeny with application.
2. upload the mentioned file
3. the backend must perform the validation and return an error message
4. See error

Expected behavior
When returning an error message the client should cancel the operation of uploading a file in chunks.

Screenshots
The upload remains in an indeterminate state and does not send or complete the operation.

Desktop (please complete the following information):

• OS: [Windows]
• Browser [firefox]
• Version [129.0.2]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context