Option to install null or is it bad practice?

[TheXRMonk]

Is your feature request related to a problem? Please describe.
If we have "optional" dependencies, we can't just install "null". We will get errors.

Describe the solution you'd like
Maybe if we just explicitly install null;

then we could handle errors where the injection is null instead? or is it bad practice?

Describe alternatives you've considered
Refactor dependencies so the "optional" service is depending on the caller instead. Or implement a "dummy service".

Additional context
N/A