create error log

src/server/routes/apiv3/slack-integration.js

@@ -275,7 +275,9 @@ module.exports = (crowi) => {
       return res.apiv3({ slackBotToken });
     }
     catch (error) {
-      console.log('error dayo');
+      const msg = 'Error occured in testing to notify slack work space';
+      logger.error('Error', error);
+      return res.apiv3Err(new ErrorV3(msg, 'test-notify-slack-work-space-failed'), 500);
     }
   });