fix: handle non-existing current context

[cmeury]

fixes #13

Check for exit code, then set current to empty string. This will have no effect on the list of contexts, and also appending it at the end works because of the added control character \c which skips the newline.

[cmeury]

Resolved the conflict, ready to merge.

[cmeury]

Still ready to merge :)

[koenbollen]

@joosterman Can you maybe hit that merge button?

[koenbollen]

Thanks! 🤗