Major Description
As mentioned on-list, with the parser modularisation changes in 2.x, the chances of a newbie getting something wrong goes up. We should therefore change the default in 2.x to warn (rather than silently ignore) if parsers or detectors are missing / none are defined
This remains configurable with Tika Config XML, explicit TikaConfig object setup etc, so it can be easily silenced if wanted. It's just the default which will warn people if they've made a mistake!