[Stripe] Show payment details even after stripe subscription has expired

lib/ui/payment/stripe_subscription_page.dart

@@ -44,7 +44,7 @@ class _StripeSubscriptionPageState extends State<StripeSubscriptionPage> {
   FreePlan _freePlan;
   List<BillingPlan> _plans = [];
   bool _hasLoadedData = false;
-  bool _isActiveStripeSubscriber;
+  bool _isStripeSubscriber = false;
   bool _showYearlyPlan = false;
 
   @override
@@ -59,9 +59,7 @@ class _StripeSubscriptionPageState extends State<StripeSubscriptionPage> {
       _currentSubscription = subscription;
       _showYearlyPlan = _currentSubscription.isYearlyPlan();
       _hasActiveSubscription = _currentSubscription.isValid();
-      _isActiveStripeSubscriber =
-          _currentSubscription.paymentProvider == kStripe &&
-              _currentSubscription.isValid();
+      _isStripeSubscriber = _currentSubscription.paymentProvider == kStripe;
       _usageFuture = _billingService.fetchUsage();
       return _filterStripeForUI().then((value) {
         _hasLoadedData = true;
@@ -158,8 +156,7 @@ class _StripeSubscriptionPageState extends State<StripeSubscriptionPage> {
       widgets.add(_stripeRenewOrCancelButton());
     }
 
-    if (_hasActiveSubscription &&
-        _currentSubscription.productID != kFreeProductID) {
+    if (_currentSubscription.productID != kFreeProductID) {
       widgets.addAll([
         Align(
           alignment: Alignment.center,
@@ -189,11 +186,11 @@ class _StripeSubscriptionPageState extends State<StripeSubscriptionPage> {
                 children: [
                   RichText(
                     text: TextSpan(
-                      text: !_isActiveStripeSubscriber
+                      text: !_isStripeSubscriber
                           ? "visit ${_currentSubscription.paymentProvider} to manage your subscription"
                           : "payment details",
                       style: TextStyle(
-                        color: _isActiveStripeSubscriber
+                        color: _isStripeSubscriber
                             ? Colors.blue
                             : Colors.white,
                         fontFamily: 'Ubuntu',
@@ -322,7 +319,7 @@ class _StripeSubscriptionPageState extends State<StripeSubscriptionPage> {
                 }
               }
               String stripPurChaseAction = 'buy';
-              if (_isActiveStripeSubscriber) {
+              if (_isStripeSubscriber && _hasActiveSubscription) {
                 // confirm if user wants to change plan or not
                 var result = await showChoiceDialog(
                     context,