models2: Fixed error caused by empty change set in edit

models/characters/edit.go

@@ -23,6 +23,10 @@ func Edit(character models.Character, name, shortName, description *string) (mod
 		changes["description"] = *description
 	}
 
+	if len(changes) == 0 {
+		return character, nil
+	}
+
 	err := collection.UpdateId(character.ID, bson.M{"$set": changes})
 	if err != nil {
 		return models.Character{}, err