Changes made to plugins to prevent the display of python stack trace and...

Display of python stack trace is removed and the user has been shown message to view the help page to use the tool correctly.
The issue is not fully completed. Still working on the part : 
[] USER ERROR: Plugin: bruteforce/Password_Bruteforce@OWTF-ABrF-001.py requires argument: 'CATEGORY'
Any help on how to proceed on the above USER ERROR would be helpful !
Thanks in advance.