chore(run): Print error without panic when config is invalid.

[Teufelchen1]

Hi! 🦓

The Rust docs say about expect(): Because this function may panic, its use is generally discouraged. Instead, prefer to use pattern matching and handle the [Err](https://doc.rust-lang.org/std/result/enum.Result.html#variant.Err) case explicitly[..]

I tried to fix this accordingly.

[EdJoPaTo]

Because this function may panic

expect is mostly discouraged for library code and situation where it could be possible to handle the error gracefully. In this case the process is stopping early either way.

My personal way of approaching them (I'm not perfect there either): unwrap only in tests or Lazy, expect when there is no way to continue the process and Result when something could continue. Library code shouldn't use panics at all.

In this case the process is ending either way. Only the output is a bit nicer. At the cost of more code (in a function with clippy::too_many_lines already allowed 😬)

[EdJoPaTo]

Still not sure what to think about this. I both like cleaner output in error cases and I like the shorter code of the expect function…

[Teufelchen1]

While working on this, I experimented with building this error message & clean exit into the config loader. This ofc slightly altered the behavior / output of the check command. Would you like that more? I personally rejected that approach as I found it more clear to read, when the error is propagated up, instead of a having a config loader which "randomly" exists the executable.

[EdJoPaTo]

I think I prefer the .expect currently. Its a one liner which is exactly doing what is needed here: Printing out a message when its an Err case.

In the long run thinking about https://github.com/EdJoPaTo/website-stalker/discussions/172 is probably the best way to improve usability.

Thank you for thinking about ways to improve the tool. Rethinking some ways is always valuable!