Wrong constant name in scheduler.py

[aheretic]

Hi, I had en error when try to start my script with scrapy and scrapy-rabbitmq
`2016-04-12 14:34:06 [twisted] CRITICAL: Unhandled error in Deferred:

Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1274, in unwindGenerator
return _inlineCallbacks(None, gen, Deferred())
File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1128, in _inlineCallbacks
result = g.send(result)
File "/usr/local/lib/python2.7/site-packages/scrapy/crawler.py", line 73, in crawl
yield self.engine.open_spider(self.spider, start_requests)
File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1274, in unwindGenerator
return _inlineCallbacks(None, gen, Deferred())
--- ---
File "/usr/local/lib/python2.7/site-packages/twisted/internet/defer.py", line 1128, in _inlineCallbacks
result = g.send(result)
File "/usr/local/lib/python2.7/site-packages/scrapy/core/engine.py", line 238, in open_spider
yield scheduler.open(spider)
File "/app/project/external_apps/scrapy_rabbitmq/scheduler.py", line 56, in open
if len(self.queue):
File "/app/project/external_apps/scrapy_rabbitmq/queue.py", line 54, in len
response = self.server.queue_declare(self.key, passive=True)
File "/usr/local/lib/python2.7/site-packages/pika/adapters/blocking_connection.py", line 2329, in queue_declare
self._flush_output(declare_ok_result.is_ready)
File "/usr/local/lib/python2.7/site-packages/pika/adapters/blocking_connection.py", line 1181, in _flush_output
raise exceptions.ChannelClosed(method.reply_code, method.reply_text)
pika.exceptions.ChannelClosed: (404, "NOT_FOUND - no queue 'my_spider:requests' in vhost 'docker'")
2016-04-12 14:34:06 [twisted] CRITICAL: `

I set settings as in example. Queue with name RABBITMQ_QUEUE_NAME from settings in my rabbitMQ server will be created.
Queue with name "my_spider:request" wasn't created.

[roycehaynes]

@aheretic - I'll try to re-create the issue and see if I can fix. Thanks for reporting.