Also do not allow empty CLI arguments

Description

Disallows empty CLI arguments, such as name=. This is to simplify the Dockerfile in case auto-generated names are desired.

Changes

• Empty CLI arguments are also disallowed by getOne

Additions

None.

Test and Review

To be filled in by the reviewers

• All of the methods are commented to expectation

• The methods are tested to satisfaction

• There are no unnecessary files present in the MR

• The continuous integration has no problems with the MR

• The MR is filled in as requested (including labels, milestones, and reviewers)

• The documentation is up-to-date

• All nullable parameters are marked as such