[misc] Fixed syntax error
[misc] Fixed syntax error

* Removes usage of unreferenced variable in error_manager.py
owtf/owtf,DarKnight--/owtf,owtf/owtf,DarKnight--/owtf,DarKnight--/owtf,DarKnight24/owtf,DarKnight24/owtf,DarKnight24/owtf,owtf/owtf,owtf/owtf,DarKnight24/owtf,owtf/owtf,DarKnight--/owtf