Shows 'unique field' message in text filters. Fixes 'This column empty' message showing too early
Merge branch 'develop' of github.com:CartoDB/cartodb20 into develop

* 'develop' of github.com:CartoDB/cartodb20:
  Target v2.0.12
  Adjusts sql function loading log messages
  Sets sql log level to :debug
  Changes default log level to :info on production and staging
  Changes CartoDB logger format
  Set correct versions in NEWS.md