Fix crash when 422 on join is returned #1736
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When we receive a
422 - Unprocessable entityerror (so the remote could not be reached),ocs.datais an empty array instead ofnil, which is why we crash here. So we need to make sure we got a dictionary, before accessing any keys.Ref
https://github.com/nextcloud/spreed/blob/df923967fa31f9abe1c674f43b2ed88f3064415b/lib/Middleware/InjectionMiddleware.php#L411-L417