Summary:
We currently handle empty body poorly in the iOS blob implementation, this happens because of an early return that cause the blob response to not be processed by the blob module, resulting in an empty string as the body instead of a blob object. We also need to make sure to create an empty blob object when data is nil (empty body) as per the XMLHttpRequest spec. The Android implementation was already handling this properly.
Fixes#18223
Send a HEAD request
```js
fetch('https://apipre.monkimun.com/whoami', {
body: null,
method: 'HEAD',
headers: {
Accept: 'application/json',
'Content-Type': 'application/json',
},
})
```
[IOS][BUGFIX][Blob] - Fix blob response parsing for empty body
Closes https://github.com/facebook/react-native/pull/18547
Differential Revision: D7415950
Pulled By: hramos
fbshipit-source-id: 56860532c6171255869f02a0960f55d155184a46
f5207ba9c7