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Fix upgrading a room without events field in power levels
#16725
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Fixes #16715, per #16715 (comment). Looks to have been introduced in #6237.
C.f. https://spec.matrix.org/v1.9/client-server-api/#mroompower_levels
Sanity checking Erik's reasoning, the point of this code is to ensure that the upgrader is able to set any state in the new room. If
event_power_levelsis empty then there are no extra requirements to impose, so I think a fallback of0is sensible.