text: Title: ObtainJSONWebToken endpoint not working for user.is_active = False
  Body: when user is not active..endpoint does not shows "User account is disabled"
  
  ???????
  if all(credentials.values()):
              user = authenticate(**credentials)
  
              if user:
                  if not user.is_active:
                      msg = _('User account is disabled.')
                      raise serializers.ValidationError(msg)
  
                  payload = jwt_payload_handler(user)
  
                  return {
                      'token': jwt_encode_handler(payload),
                      'user': user
                  }
              else:
                  msg = _('Unable to log in with provided credentials.')
                  raise serializers.ValidationError(msg)