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Describe behaviour when the topic key is falsey in a m.room.topic event. (#2068)

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We seem to have [updated this for m.room.name](https://github.com/matrix-org/matrix-spec/pull/1639) some years back but omitted it for topic.
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changelogs/client_server/newsfragments/2068.clarification Normal file
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Clarify behaviour when the `topic` key of a `m.room.topic` event is absent, null, or empty.

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data/event-schemas/schema/m.room.topic.yaml
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---
allOf:
- $ref: core-event-schema/state_event.yaml
description: 'A topic is a short message detailing what is currently being discussed in the room. It can also be used as a way to display extra information about the room, which may not be suitable for the room name. The room topic can also be set when creating a room using `/createRoom` with the `topic` key.'
description: |-
A topic is a short message detailing what is currently being discussed in the room.
It can also be used as a way to display extra information about the room, which may not
be suitable for the room name.
The room topic can also be set when creating a room using `/createRoom` with the `topic` key.'
If the `topic` property is absent, null, or empty then the topic is unset. In other words,
an empty `topic` property effectively resets the room to having no topic.
properties:
content:
properties: