Unused code causing undefined notices in watchdog

In the module opigno_statisics_app.module, opigno_statistics_app_exit() throws undefined index on the SESSION variables lines 260-269. From looking at the code, that query's result doesn't do anything now that the $first_login code is commented out. So I have commented it out also and suggest if it will be re-enabled, that it is moved inside the isset() check for those session vars.