server: fix bug in ListUsers to handle no users

server/api/db.go

@@ -70,7 +70,7 @@ func dbGetAllUsers() ([]*User, error) {
 	}
 	if len(users) == 0 {
 		slog.Debug("db: no users found")
-		return nil, errors.New("no users found")
+		return nil, ErrUserNotFound
 	}
 
 	slog.Debug("db: user list returned")

server/api/user.go

@@ -52,8 +52,12 @@ func ListUsers(w http.ResponseWriter, r *http.Request) {
 	slog.Debug("user: entering ListUsers handler")
 	dbUsers, err := dbGetAllUsers()
 	if err != nil {
+		if errors.Is(err, ErrUserNotFound) {
+			render.Render(w, r, ErrNotFound)
+		} else {
 			slog.Error("user: failed to fetch users", "error", err)
 			render.Render(w, r, ErrInternal(err))
+		}
 		return
 	}