fix: fix non-view-only keys-only wallet keys dialog

Author: sneurlax

lib/pages/settings_views/wallet_settings_view/wallet_settings_view.dart

@@ -200,7 +200,11 @@ class _WalletSettingsViewState extends ConsumerState<WalletSettingsView> {
             (wallet as ViewOnlyOptionInterface).isViewOnly) {
           // TODO: is something needed here?
         } else {
-          mnemonic = await wallet.getMnemonicAsWords();
+          try {
+            mnemonic = await wallet.getMnemonicAsWords();
+          } catch (_) {
+            // Key-restored wallets may not have a mnemonic.
+          }
         }
       }
     }

lib/pages/settings_views/wallet_settings_view/wallet_settings_wallet_settings/delete_wallet_warning_view.dart

@@ -141,7 +141,11 @@ class DeleteWalletWarningView extends ConsumerWidget {
                           wallet.isViewOnly) {
                         viewOnlyData = await wallet.getViewOnlyWalletData();
                       } else if (wallet is MnemonicInterface) {
-                        mnemonic = await wallet.getMnemonicAsWords();
+                        try {
+                          mnemonic = await wallet.getMnemonicAsWords();
+                        } catch (_) {
+                          // Key-restored wallets may not have a mnemonic.
+                        }
                       }
                     }
                     if (context.mounted) {

lib/pages_desktop_specific/my_stack_view/wallet_view/sub_widgets/desktop_attention_delete_wallet.dart

@@ -166,7 +166,12 @@ class _DesktopAttentionDeleteWallet
                           // TODO: [prio=med] handle other types wallet deletion
                           // All wallets currently are mnemonic based
                           if (wallet is MnemonicInterface) {
-                            final words = await wallet.getMnemonicAsWords();
+                            List<String> words = [];
+                            try {
+                              words = await wallet.getMnemonicAsWords();
+                            } catch (_) {
+                              // Key-restored wallets may not have a mnemonic.
+                            }
 
                             if (context.mounted) {
                               await Navigator.of(context).pushNamed(

lib/pages_desktop_specific/my_stack_view/wallet_view/sub_widgets/unlock_wallet_keys_desktop.dart

@@ -119,7 +119,11 @@ class _UnlockWalletKeysDesktopState
             (wallet as ViewOnlyOptionInterface).isViewOnly) {
           // TODO: is something needed here?
         } else {
-          words = await wallet.getMnemonicAsWords();
+          try {
+            words = await wallet.getMnemonicAsWords();
+          } catch (_) {
+            // Key-restored wallets may not have a mnemonic.
+          }
         }
       }