Strict Mode / Better Errors when dependency is missing

[genixpro]

I've been using this library for a while, and its great. I am often using strings to reference my dependencies, e.g. Provide['stuff']. And I have different application containers that support different configurations of applications.

Right now, if I forget a key dependency for a specific container, I end up getting an error that looks like this:

AttributeError: 'Provide' object has no attribute 'get_by_user_id'

This is because DI could not find the dependency. I would rather that the DI framework itself just threw a more descriptive error, e.g. "XYZ Dependency Not Found"