WebUIs: add a nil check for token in refresh cookie method

token should never be null here because we have an authenticated user
however add the same check as elsewhere

Signed-off-by: Nicola Murino <nicola.murino@gmail.com>

internal/httpd/server.go

@@ -1001,7 +1001,7 @@ func (s *httpdServer) checkCookieExpiration(w http.ResponseWriter, r *http.Reque
 		return
 	}
 	token, claims, err := jwtauth.FromContext(r.Context())
-	if err != nil {
+	if err != nil || token == nil {
 		return
 	}
 	tokenClaims := jwtTokenClaims{}