Pete Bacon Darwin 8ebac24b48 fix(core): ensure sanitizer works if DOMParser return null body (#40107)
In some browsers, notably a mobile version of webkit on iPad, the
result of calling `DOMParser.parseFromString()` returns a document
whose `body` property is null until the next tick of the browser.
Since this is of no use to us for sanitization, we now fall back to the
"inert document" strategy for this case.

Fixes #39834

PR Close #40107
2021-01-06 10:32:24 -08:00
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