Restore createRoom.canEncryptToAllUsers (#10491)

src/createRoom.ts

@@ -399,11 +399,9 @@ export async function canEncryptToAllUsers(client: MatrixClient, userIds: string
     try {
         const usersDeviceMap = await client.downloadKeys(userIds);
 
-        // There are no devices at all.
-        if (usersDeviceMap.size === 0) return false;
-
         for (const devices of usersDeviceMap.values()) {
             if (devices.size === 0) {
+                // This user does not have any encryption-capable devices.
                 return false;
             }
         }