[Distributed] Return value obtained from call_on_owner directly

[krynju]

Fixes #43396
Caused by this: #42339

v_local stores the value obtained through call_on_owner.

I forgot this value is not wrapped in Some and the code was attemptingto unwrap it with something at the end of the function.

Worked well for non-nothing values, but when fetch was actually returning a nothing value then an error was thrown due to something(nothing) being illegal

2nd test case is not related to the issue, but added it for safety in case there's any further work done on this part of code

[Sacha0]

Superficially LGTM! Thanks for the amazingly rapid fix @krynju! :)