queue.pause(true, true) initializes bclient unnecessarily

[gabegorelick]

Description

When pausing a queue locally and not waiting for active jobs to finish, ie when calling queue.pause(true, true), Bull will initialize the blocking Redis client even if that client wasn't previously initialized.

This is a similar issue as #1346, but that issue dealt with queue.pause(true), and this issue is about queue.pause(true, true).

Minimal, Working Test code to reproduce the issue.

const Queue = require('bull');
const Redis = require('ioredis');

const queue = new Queue('foo', {
  createClient (type) {
    if (type === 'bclient') {
      throw new Error('This queue is not meant for processing');
    }

    return new Redis();
  }
});
queue.pause(true, true);

Bull version

develop