[whatwg/xhr] interop: blob with empty content type is not converted to text/xml (Issue #357)

According to https://xhr.spec.whatwg.org/#response-mime-type:

> If mimeType is failure, then set mimeType to text/xml.

Note: The content-type of the blob is set to `""` (an invalid mime type) when the input `type` is not set or is invalid.

|Test                         |Firefox      |Chrome| Safari                  |
|-------------------|----------|--------|-----------------|
|no content type     | `text/xml`|`null`   |`""`                      |
|bad content type   | `text/xml`|`null`   |`""`                      |

Related to: https://github.com/whatwg/fetch/issues/1464 and https://github.com/whatwg/fetch/issues/1436

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