image currentSrc property can sometimes be undefined

[QuentinLowe]

image currentSrc property can sometimes be undefined

[changeset-bot]

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Latest commit: 4ba8bbb

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[eoghanmurray]

This PR could really do with a test to recreate exactly the scenario where currentSrc would be undefined; is it because of replay in a particular browser, or is there some recording that can reliably recreate the scenario in all browsers? A test is more useful than a fix as inline images has been completely overhauled in #1475

[QuentinLowe]

When the virtual DOM mode is triggered, this problem will arise.