improve csrf expiration error handling (#2695)

* add message

* re run query on result set mount if there is session time out error

superset/assets/javascripts/SqlLab/actions.js

@@ -151,6 +151,9 @@ export function runQuery(query) {
         } else if (msg === null) {
           msg = `[${textStatus}] ${errorThrown}`;
         }
+        if (msg.indexOf('The CSRF token is missing') > 0) {
+          msg = 'Your session timed out, please refresh your page and try again.';
+        }
         dispatch(queryFailed(query, msg));
       },
     });