3.0 - Fix Request::data() and Hash::get() warnings and notices

**What I'm doing:**
Using a custom validator to get validation errors in a controller.  See: https://gist.github.com/bcrowe/c439ef804cc03525ef54

**What's happening:**
See: https://gist.github.com/bcrowe/6298a6b61a46064375d9

I do get the validation errors just fine, but it comes along with these warnings/notices.