`getCurlCommand` fails when content type is `multipart/form-data` and/or `null`

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

N/A - this is observed from Sentry issues e.g. https://sentry.sentry.io/issues/5284365861/events/fe5fc8fc7e334456a5ebee74f8fadb5e/

### Expected Result

It should render the data, though it might be tricky because it may contain file data e.g. from ``.

### Actual Result

It does not render the data

### Product Area

Unknown

### Link

https://sentry.sentry.io/issues/5284365861/events/fe5fc8fc7e334456a5ebee74f8fadb5e/?project=11276&referrer=previous-event&statsPeriod=30d&stream_index=0&utc=true

### DSN

_No response_

### Version

_No response_