Correct bug when ssh-port not set

ERROR Trace :

../bin/puppet-rundeck
[2013-11-26 09:53:06] INFO  WEBrick 1.3.1
[2013-11-26 09:53:06] INFO  ruby 1.8.7 (2011-06-30) [x86_64-linux]
== Sinatra/1.4.4 has taken the stage on 8144 for development with backup
from WEBrick
[2013-11-26 09:53:06] INFO  WEBrick::HTTPServer#start: pid=23803
port=8144
NoMethodError - undefined method `+' for nil:NilClass:

/usr/lib/ruby/gems/1.8/gems/puppet-rundeck-2013-0.0.12/lib/puppet-rundeck.rb:141:in
`respond'

/usr/lib/ruby/gems/1.8/gems/puppet-rundeck-2013-0.0.12/lib/puppet-rundeck.rb:71:in
`each'

/usr/lib/ruby/gems/1.8/gems/puppet-rundeck-2013-0.0.12/lib/puppet-rundeck.rb:71:in
`respond'

/usr/lib/ruby/gems/1.8/gems/puppet-rundeck-2013-0.0.12/lib/puppet-rundeck.rb:159:in
`GET /'