Handle empty rooms when generating email notifications. (#9257)

Fixes some exceptions if the room state isn't quite as expected. If the expected state events aren't found, try to find them in the historical room state. If they still aren't found, fallback to a reasonable, although ugly, value.
matrix-org · Feb 4, 2021 · 792263c · 792263c
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diff --git a/changelog.d/9257.bugfix b/changelog.d/9257.bugfix
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+Fix long-standing bug where sending email push would fail for rooms that the server had since left.