Returning so() as a fallback

[AlexanderPavlenko]

Hello! Thanks for this code, I like the idea.
There is one thing which caught my attention:
get_object() is not equal to so(), but get_object('NameWithTypo') returns so().
I think in order to optimize UX every name string should be considered mistyped and the unexpected results will cause confusion until the typo is noticed.
get_object(None) returns so() too, but if ref argument contains None isn't it a mistake as well?

[curtisjamesholt]

I agree, changed for 0.0.6.