Normally this isn't a problem since character must always use the magical weapon instead of a mundane one if they have both. It becomes a problem however when the magical weapon is of one-shot only type, like Web of Shadows, which you very often combine with a normal weapon.
The error message resulting from taking both magical and mundane weapon is unnecessary and serves only to cause confusion.
The error message resulting from taking both magical and mundane weapon is unnecessary and serves only to cause confusion.