We should ensure that a listener can continue to listen to a page even if (another) user edits it.

There are a variety of scenarios around this

1. You visit the current version of a page, you start listening to it, someone changes it.
2. You visit the current version of a page, you start listening to it, someone deletes it.
3. You visit the current version of a page, you start listening to it, someone changes it then suppresses the text of the version you are listening to.
4. You visit the current version of a page, someone changes it, you press play.
5. You visit the current version of a page, someone changes it, you press Listen.

Ideally in all of these cases playback should be possible but only the first MUST work, with number 4 and 5 also being very desirable.

Reason why it would be desirable for 2. and 3. to work is that the actual text will still be in front of the user. Failing will actually draw more attention to whatever triggered the delete/supression.