Make 'event.redacts' never raise. (#6771)

There are quite a few places that we assume that a redaction event has a
corresponding `redacts` key, which is not always the case. So lets
cheekily make it so that event.redacts just returns None instead.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/6771.bugfix b/changelog.d/6771.bugfix
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index 0000000000..623ba24acb
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+++ b/changelog.d/6771.bugfix
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+Fix persisting redaction events that have been redacted (or otherwise don't have a redacts key).