Fixes undefined method `join' for nil:NilClass in quit method. Issue #77.
Exception:
2016-07-26_08:31:54.08717 /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/mailbox_watcher.rb:50:in quit': undefined methodjoin' for nil:NilClass (NoMethodError)
2016-07-26_08:31:54.08721 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:30:in each' 2016-07-26_08:31:54.08721 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:30:inquit'
2016-07-26_08:31:54.08722 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:25:in ensure in run' 2016-07-26_08:31:54.08722 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:25:inrun'
2016-07-26_08:31:54.08722 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/cli.rb:52:in `start'
Fixes undefined method `join' for nil:NilClass in quit method. Issue #77.
Exception: 2016-07-26_08:31:54.08717 /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/mailbox_watcher.rb:50:in
quit': undefined method
join' for nil:NilClass (NoMethodError) 2016-07-26_08:31:54.08721 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:30:ineach' 2016-07-26_08:31:54.08721 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:30:in
quit' 2016-07-26_08:31:54.08722 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:25:inensure in run' 2016-07-26_08:31:54.08722 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/coordinator.rb:25:in
run' 2016-07-26_08:31:54.08722 from /opt/gitlab/embedded/service/gem/ruby/2.1.0/gems/mail_room-0.8.0/lib/mail_room/cli.rb:52:in `start'