Re: [PATCH proxmox] resource-scheduling: topsis: add context to 'unwraps'

["Dominik Rusovac" <d.rusovac@proxmox.com>]

I agree, unwrapping the option is indeed questionable. Yet these unwraps
seemed good enough and I didn't want to touch the error handling itself,
as it would entail more changes. Atm, we have no designated Error types
to map to and imo just bail!-ing on a Result in this place adds no
reasonable value. Consistently propagating errors from start to end
would be more appropriate, I suppose.

For now, I just added some context as to what must have gone wrong in
this very situation, because it changes just a tiny bit of code, while
adding reasonable information. 

I could send a v2 that touches error handling in general, though.