"error.request is undefined" when a request is cancelled

[danxuliu]

Regression introduced in #510

config, response and request may not be defined in some cases, so since #510 trying to destructure request: { responseURL } fails in those cases (error.request is undefined). This can be seen when a request is canceled in Talk, although I do not know if the problem is specific to using the deprecated CancelToken or if it happens too when a request is aborted using the AbortController (or in other cases).

[julien-nc]

The problem is the same whether we use AbortController or CancelToken. The suggested fix solves the issue in both cases.

[ChristophWurst]

2.3.0 released.