Issues with processing nil as input

[okazymyrov]

• Version: logstash-filter-oui-3.0.1

• Operating System: Linux kali 4.9.0-kali4-amd64 #1 SMP Debian 4.9.30-2kali1 (2017-06-22) x86_64 GNU/Linux

• Config File (if you have sensitive info, please remove it):

  
  input {
  generator {
      message => ", 2017-06-29 16:03:40, 44,  -1, OPN, ,   ,  -1,        0,        3,   0.  0.  0.  0,   0, , "
      count => 1
  }
  }

filter { csv { columns => [ "BSSID","First time seen","Last time seen","channel","Speed","Privacy","Cipher","Authentication","Power","# beacons","# IV","LAN IP","ID-length","ESSID","Key" ] }

oui {
    source => "BSSID"
    target => "BSSID OUI"
}

}

output { stdout { codec => rubydebug } }

- Sample Data:
In the above config.

- Steps to Reproduce:
/usr/share/logstash/bin/logstash -f ./example.conf

- Error 

10:08:21.101 [[main]>worker1] ERROR logstash.pipeline - Exception in pipelineworker, the pipeline stopped processing new events, please check your filter configuration and restart Logstash. {"exception"=>"undefined method strip' for nil:NilClass", "backtrace"=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/oui-offline-1.2.7-java/lib/oui.rb:109:into_i'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/oui-offline-1.2.7-java/lib/oui.rb:97:in find'", "/usr/share/logstash/vendor/jruby/lib/ruby/1.9/monitor.rb:211:inmon_synchronize'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/oui-offline-1.2.7-java/lib/oui.rb:95:in find'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-oui-3.0.1-java/lib/logstash/filters/oui.rb:33:infilter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:in do_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:inmulti_filter'", "org/jruby/RubyArray.java:1613:in each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:inmulti_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:43:in multi_filter'", "(eval):68:infilter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:370:in filter_batch'", "org/jruby/RubyProc.java:281:incall'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:224:in each'", "org/jruby/RubyHash.java:1342:ineach'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:223:in each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:369:infilter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:350:in worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:317:instart_workers'"]} 10:08:21.115 [LogStash::Runner] FATAL logstash.runner - An unexpected error occurred! {:error=>#<NoMethodError: undefined method strip' for nil:NilClass>, :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/1.9/gems/oui-offline-1.2.7-java/lib/oui.rb:109:into_i'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/oui-offline-1.2.7-java/lib/oui.rb:97:in find'", "/usr/share/logstash/vendor/jruby/lib/ruby/1.9/monitor.rb:211:inmon_synchronize'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/oui-offline-1.2.7-java/lib/oui.rb:95:in find'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-oui-3.0.1-java/lib/logstash/filters/oui.rb:33:infilter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:145:in do_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:164:inmulti_filter'", "org/jruby/RubyArray.java:1613:in each'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:161:inmulti_filter'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:43:in multi_filter'", "(eval):68:infilter_func'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:370:in filter_batch'", "org/jruby/RubyProc.java:281:incall'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:224:in each'", "org/jruby/RubyHash.java:1342:ineach'", "/usr/share/logstash/logstash-core/lib/logstash/util/wrapped_synchronous_queue.rb:223:in each'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:369:infilter_batch'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:350:in worker_loop'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:317:instart_workers'"]}

[jordansissel]

This is a bug.