I think you will be absolutely fine, OP. Even when I’ve had the occasional grilling at a European border, no one has ever asked about whether I have ever been arrested or have a criminal record. And it sounds as if you have had this episode expunged anyway.

I think it’s very unlikely that you are ever asked about past arrests or convictions at a border of another country and, if you are, it would be reasonable to say that you do not have a criminal record. Most countries you are likely to visit will not even ask you questions beyond the reason for your visit and where you will be staying. Many border staff will not even bother to ask this.

I hope we have been sufficiently reassuring in this thread, but do feel free to ask if you have any more questions. I am sure we all would like you to feel more empowered and less anxious about travel after reading these responses.