Johannes Altmanninger 1df64a4891 Replace maybe_t::missing_or_empty with a more Rust-friendly helper ...

There are many places where we want to treat a missing variable the same as
a variable with an empty value.

In C++ we handle this by branching on maybe_t<env_var_t>::missing_or_empty().
If it returns false, we go on to access maybe_t<env_var_t>::value() aka
operator*.

In Rust, Environment::get() will return an Option<EnvVar>.
We could define a MissingOrEmpty trait and implement it for Option<EnvVar>.

However that will still leave us with ugly calls to Option::unwrap()
(by convention Rust does use shorthands like *).

Let's add a variable getter that returns none for empty variables.

2023-04-21 13:57:29 +02:00

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