Fix: Enable add button when name is not null

Signed-off-by: Neeraj Gupta <254676+ua741@users.noreply.github.com>

lib/ui/viewer/location/add_location_sheet.dart

@@ -76,12 +76,13 @@ class _AddLocationSheetState extends State<AddLocationSheet> {
   late ValueNotifier<double> _selectedRadiusNotifier;
   final _focusNode = FocusNode();
   final _textEditingController = TextEditingController();
-  final _isEmptyNotifier = ValueNotifier(true);
+  late final ValueNotifier<bool> _isEmptyNotifier;
   Widget? _keyboardTopButtons;
 
   @override
   void initState() {
     _textEditingController.text = widget.name;
+    _isEmptyNotifier = ValueNotifier(widget.name.isEmpty);
     _focusNode.addListener(_focusNodeListener);
     _selectedRadiusNotifier = ValueNotifier(widget.radius);
     _selectedRadiusNotifier.addListener(_selectedRadiusListener);