[pve-devel] [PATCH pve_flutter_frontend] fix: ui: null check operator used on null value error on resource tab

[Shan Shaji]

The issue occurred because the null assertion operator (!) was used on
the `template`` variable, which was potentially null. When the
`PveGuestIcon` widget started rendering, it first checked the if
condition inside the build method. If the `template` variable was
null at that point, Flutter threw an error because the null
assertion operator (!) was used, asserting that the variable
was not null.

To fix this, the bang operator (!) and the nullable operator (?)
is removed. Additionally, in the `PveGuestListTile`, a default
value of `false` is assigned when the `template` value is null.

Summary of the changes:
- Removed the bang operator (!) from the `template` variable
  in `PveGuestIcon`.
- Removed the nullable operator (?).
- Assigned a default value of false to `template` in `PveGuestListTile`
  when it's null.

Signed-off-by: Shan Shaji <s.shaji at proxmox.com>
---
 lib/pages/main_layout_slim.dart        | 2 +-
 lib/widgets/pve_guest_icon_widget.dart | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/pages/main_layout_slim.dart b/lib/pages/main_layout_slim.dart
index ac5a6f9..04e21e7 100644
--- a/lib/pages/main_layout_slim.dart
+++ b/lib/pages/main_layout_slim.dart
@@ -694,7 +694,7 @@ class PveGuestListTile extends StatelessWidget {
     return ListTile(
       leading: PveGuestIcon(
         type: resource.type,
-        template: resource.template,
+        template: resource.template ?? false,
         status: status,
       ),
       title: Text(resource.displayName),
diff --git a/lib/widgets/pve_guest_icon_widget.dart b/lib/widgets/pve_guest_icon_widget.dart
index 4dd7a58..1cdee7e 100644
--- a/lib/widgets/pve_guest_icon_widget.dart
+++ b/lib/widgets/pve_guest_icon_widget.dart
@@ -4,7 +4,7 @@ import 'package:pve_flutter_frontend/utils/renderers.dart';
 
 class PveGuestIcon extends StatelessWidget {
   final String type;
-  final bool? template;
+  final bool template;
   final PveResourceStatusType? status;
   final Color color;
   final Color templateColor;
@@ -20,7 +20,7 @@ class PveGuestIcon extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    if (template!) {
+    if (template) {
       return SizedBox(
         height: 24,
         width: 36,
-- 
2.39.5