[skip ci] fix issues from code review

lib/ionia/ionia_gift_card.dart

@@ -37,7 +37,7 @@ class IoniaGiftCard {
             purchaseAmount: element['PurchaseAmount'] as double,
             actualAmount: element['ActualAmount'] as double,
             totalTransactionAmount: element['TotalTransactionAmount'] as double,
-            totalDashTransactionAmount: element['TotalDashTransactionAmount'] != null ? element['TotalDashTransactionAmount'] as double : 0.0,
+            totalDashTransactionAmount: (element['TotalDashTransactionAmount'] as double?) ?? 0.0,
             remainingAmount: element['RemainingAmount'] as double,
             isActive: element['IsActive'] as bool,
             isEmpty: element['IsEmpty'] as bool,

lib/src/screens/ionia/cards/ionia_more_options_page.dart

@@ -31,15 +31,14 @@ class IoniaMoreOptionsPage extends BasePage {
             height: 10,
           ),
           Center(
-              child: Text(
-            S.of(context).choose_from_available_options,
-            style: textMedium(
-              color: Theme.of(context).primaryTextTheme.headline6!.color!,
+            child: Text(
+              S.of(context).choose_from_available_options,
+              style: textMedium(
+                color: Theme.of(context).primaryTextTheme.headline6!.color!,
+              ),
             ),
-          )),
-          SizedBox(
-            height: 40,
           ),
+          SizedBox(height: 40),
           InkWell(
             onTap: () async {
               final amount = await Navigator.of(context)

lib/view_model/ionia/ionia_custom_redeem_view_model.dart

@@ -35,7 +35,7 @@ abstract class IoniaCustomRedeemViewModelBase with Store {
 
   @action
   void updateAmount(String text) {
-    amount = text.isEmpty ? 0 : (double.parse(text.replaceAll(',', '.')));
+    amount = double.tryParse(text.replaceAll(',', '.')) ?? 0;
   }
 
   @action