settings: fix snackbar message on cancelling export

docs/changelog/v0.4.0.md

@@ -26,6 +26,7 @@
 - Remove duplicate date separators in the history page.
 - Don't allow users to search for the `On:` and `Kun:` labels on the kanji result page.
 - Strip leading and trailing whitespace from search queries.
+- Fix a bug where cancelling an export would print a misleading status message.
 
 ## Other 📝
 

lib/screens/settings.dart

@@ -99,7 +99,12 @@ class _SettingsViewState extends State<SettingsView> {
     );
 
     if (!context.mounted) return;
-    showSnackbar(context, 'Exported data to $saveFile');
+
+    if (saveFile == null) {
+      showSnackbar(context, 'Export cancelled');
+    } else {
+      showSnackbar(context, 'Exported data to $saveFile');
+    }
   }
 
   Future<void> importHandler(context) async {