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In certain cases, like when `SiteSetting.slug_generation_method` is set to `none` with certain locales, the autogenerated chat channel slugs will end up blank. This was causing errors in unrelated jobs calling `update!` on the channel. Instead, we should just copy Category behaviour, which does not error if the autogenerated slug ends up blank. We already allow for this with chat channel URLs, using `-` in place of the missing slug.