If a card's effect has two parts joined by "and" and one cannot happen, do I still do the other?

Question

Accepted Answer

Yes. Do as much of the effect as you can and skip the part that cannot happen, for example gaining a condition you already have. This comes from a designer reply relayed in a thread, which replaced earlier all-or-nothing answers.

The Lord of the Rings: Journeys in Middle-earth

If a card's effect has two parts joined by "and" and one cannot happen, do I still do the other?