vcardutils: prevent invalid index crash
vcardutils: prevent invalid index crash

Issue: #79346
Change-Id: I331ca50093a99be303c51f4310996d28d2926936

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc