text: Title: Cannot translate text: 'NoneType' object has no attribute 'translate'
  Body: On the website ([libretranslate.com](https://libretranslate.com/?source=auto&target=en)) I ran into this error when trying to translate Norwegian text with **Auto Detect (Experimental)** enabled.
  
  It results in a 500 (internal server error) with the following message:
  
  > Cannot translate text: 'NoneType' object has no attribute 'translate'
  
  ~~I'm going to assume that the error stems from the auto-detection picking out a language which LibreTranslate doesn't support, but have not verified if this is the case yet. (Just a hypothesis.)~~
  
  I realize now that LibreTranslate doesn't support Norwegian, but this should still probably be handled better regardless.
  