move mapping functions out of try catch

src/scrape.js

@@ -18,13 +18,14 @@ const options = parse_args(process.argv.slice(2));
   try {
     events = await get_page_events(options);
     prev_events = await read_previous_events(options.events);
+  } catch (e) {
+    console.error(e);
+  }
+
   events = events
     .reduce(to_unique_events, prev_events)
     .map(event_date_to_date_obj)
     .sort(by_date);
-  } catch (e) {
-    console.error(e);
-  }
 
   if (options.output === null) {
     console.log(JSON.stringify(events));