fix(system): user.FindByID with nonexisting role

system/repository/role.go

@@ -81,7 +81,7 @@ func (r *role) FindByMemberID(userID uint64) ([]*types.Role, error) {
 	rval := make([]*types.Role, 0)
 	for _, id := range ids {
 		mod, err := r.FindByID(id)
-		if err != nil {
+		if err != nil && err != ErrRoleNotFound {
 			return nil, err
 		}
 		rval = append(rval, mod)

system/repository/user.go

@@ -86,7 +86,13 @@ func (r *user) FindByID(id uint64) (*types.User, error) {
 	if err := isFound(r.db().Get(mod, sql, id), mod.ID > 0, ErrUserNotFound); err != nil {
 		return nil, err
 	}
-	return mod, r.prepare(mod, "roles")
+
+	err := r.prepare(mod, "roles")
+	if err != nil {
+		return nil, err
+	}
+
+	return mod, nil
 }
 
 func (r *user) FindByIDs(IDs ...uint64) (uu types.UserSet, err error) {