add the empty unit test for the two-fer of the java track

[xinri]

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[Smarticles101]

Hey @exercism/java this has been discussed before. Hence my comment from exercism/exercism#5113

Java maintainer here 👋

In open source, it's worth it to check if an issue has come up in the past before. This has been brought up in multiple repos in including java.

Here's java/#733 (pr) and java/#728 (issue). The decision here was to treat the empty string as a name and output "One for , one for me." Personally, I agree with this decision under the basis that if a language can differentiate between an empty string and null, it should treat the empty string as a name as backed up in (problem-specifications/#290)[https://github.com/exercism/problem-specifications/issues/290#issuecomment-230727326].

My question is: should we revisit this? I'd like to get a feel for everyone's opinion on the matter.

[xinri]

I think it is better to drop this and keep the current behavior