[utils][management] Clean unused import

beat/web/utils/management/commands/list_active_users.py

@@ -27,7 +27,7 @@
 ###############################################################################
 
 
-from django.core.management.base import BaseCommand, CommandError
+from django.core.management.base import BaseCommand
 from django.contrib.auth.models import User
 from django.contrib.sessions.models import Session
 from django.utils import timezone