API support for bulk grade import/export

lms/djangoapps/grades/api.py

@@ -12,7 +12,7 @@ from lms.djangoapps.grades.models_api import *
 from lms.djangoapps.grades.tasks import compute_all_grades_for_course as task_compute_all_grades_for_course
 
 # Public Grades Modules
-from lms.djangoapps.grades import events, constants, context
+from lms.djangoapps.grades import events, constants, context, course_data
 from lms.djangoapps.grades.signals import signals
 from lms.djangoapps.grades.util_services import GradesUtilService
 

openedx/core/djangoapps/course_groups/cohorts.py

@@ -219,7 +219,7 @@ def get_cohort(user, course_key, assign=True, use_cached=False):
     Raises:
        ValueError if the CourseKey doesn't exist.
     """
-    if user.is_anonymous:
+    if user is None or user.is_anonymous:
         return None
     cache = RequestCache(COHORT_CACHE_NAMESPACE).data
     cache_key = _cohort_cache_key(user.id, course_key)