front: dont show error message on train name if focused#16011

RomainValls wants to merge 1 commit intodevOpenRailAssociation/osrd:devfrom

rvs/front-fix-train-name-error-itinerary-modalOpenRailAssociation/osrd:rvs/front-fix-train-name-error-itinerary-modalCopy head branch name to clipboard