taskforcesh / bullmq / #445 / 1

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fix(queue): ensure the Queue constructor doesn't try to set queue options if the client is closed

In my app we disconnect queues sometimes quite quickly after constructing them, and see this error every so often in our CI logs:

```
/app/node_modules/bullmq/node_modules/ioredis/built/redis/index.js:620
        command.reject(new Error(utils_1.CONNECTION_CLOSED_ERROR_MSG));
                       ^
Error: Connection is closed.
    at Redis.sendCommand (/app/node_modules/bullmq/node_modules/ioredis/built/redis/index.js:620:24)
    at Redis.hset (/app/node_modules/bullmq/node_modules/ioredis/built/commander.js:111:25)
    at /app/node_modules/bullmq/src/classes/queue.ts:29:14
```

I am not exactly sure why it only happens sometimes but not others, but regardless, I think it's a good idea not to try to run the floating `hset` in the queue constructor if the client has been closed. This prevents that by first checking if the client has been closed before doing this floating work.

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