logstash/logstash — pull request #214 by wiibaa (2012-09-27 13:58:56+00:00)
Title: Fix for LOGSTASH-610 + tests on Event.append

Small nil security change inside event.append and tentative of rspec story telling test style on Event#append, hope you like it

Also since grok singles introduction I bumped in a corner case about potential doublons in event field values list when using multiline filter (thus append method), that was not possible with all-array field before.
I added some tests, in particular two failing tests, for clarifying the issue of doublons in values as I could not find anywhere in the doc if the fields values are more assimilated to a List or a Set. Any strong opinion already ?