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[queue_depth] Allow apps to boot without ENV['PORT']#9

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ChrisLundquist wants to merge 2 commits into
heroku:masterfrom
ChrisLundquist:patch-1
Open

[queue_depth] Allow apps to boot without ENV['PORT']#9
ChrisLundquist wants to merge 2 commits into
heroku:masterfrom
ChrisLundquist:patch-1

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@ChrisLundquist
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Fixes:

TypeError: no implicit conversion of nil into String
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-queue-metrics-2.0.0/lib/queue-metrics/queue_depth.rb:32:in `+'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-queue-metrics-2.0.0/lib/queue-metrics/queue_depth.rb:32:in `getaddr'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-queue-metrics-2.0.0/lib/queue-metrics/queue_depth.rb:12:in `initialize'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:43:in `new'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:43:in `build'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `block in build'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `each'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `inject'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `build'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.7/lib/rails/engine.rb:502:in `app'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.7/lib/rails/application/finisher.rb:34:in `block in <module:Finisher>'

Fixes:
```
TypeError: no implicit conversion of nil into String
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-queue-metrics-2.0.0/lib/queue-metrics/queue_depth.rb:32:in `+'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-queue-metrics-2.0.0/lib/queue-metrics/queue_depth.rb:32:in `getaddr'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rack-queue-metrics-2.0.0/lib/queue-metrics/queue_depth.rb:12:in `initialize'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:43:in `new'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:43:in `build'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `block in build'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `each'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `inject'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/actionpack-4.2.7/lib/action_dispatch/middleware/stack.rb:118:in `build'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.7/lib/rails/engine.rb:502:in `app'
  /Users/clundquist/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.7/lib/rails/application/finisher.rb:34:in `block in <module:Finisher>'
```
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