fix: cohort certificate overrides filter

Fix get cohort for an user that as requested to be removed (pending).

fccn/nau-technical#339

Makefile

@@ -46,6 +46,9 @@ lint: ## Run linters to check code style
 	$(TOX) pycodestyle ./nau_openedx_extensions
 	$(TOX) isort --check-only --diff ./nau_openedx_extensions
 
+isort: ## Fix Python import sort
+	$(TOX) isort ./nau_openedx_extensions
+
 
 # Define PIP_COMPILE_OPTS=-v to get more information during make upgrade.
 PIP_COMPILE = pip-compile --rebuild --upgrade $(PIP_COMPILE_OPTS)

nau_openedx_extensions/edxapp_wrapper/backends/cohort_v1.py

@@ -1,14 +1,30 @@
 """
 Cohort abstraction backend
 """
-from common.djangoapps.student.models import get_user_by_username_or_email  # pylint: disable=import-error
+import logging
+import traceback
+
+from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
+from django.db.models import Q
 from openedx.core.djangoapps.course_groups.cohorts import \
     get_cohort as edxapp_get_cohort  # pylint: disable=import-error
 
+log = logging.getLogger(__name__)
+
 
 def get_cohort(username, course_key):
     """
     Get the Course Cohort for the User that belongs the username if available other case return None.
     """
-    user = get_user_by_username_or_email(username)
-    return edxapp_get_cohort(user, course_key, assign=False, use_cached=False)
+    user = None
+    # pylint: disable=broad-except
+    try:
+        user = User.objects.get(Q(username=username))
+    except Exception as e:
+        log.error("On get_cohort method error getting user %s, error: %s, stacktrace: %s", username, str(e), traceback.format_exc())
+    # pylint: disable=broad-except
+    try:
+        return edxapp_get_cohort(user, course_key, assign=False, use_cached=False)
+    except Exception as e:
+        log.error("On get_cohort method error getting cohort course_key: %s, error: %s, stacktrace: %s", course_key, str(e), traceback.format_exc())
+        return None