fix: Discussion xblock error when loading for the first time

This PR fixes the user not being created when accessing the discussion xblock as the course_key was missing in some of the api calls and that lead to the forum backend not being fetched correctly.

Author: Taimoor Ahmed

openedx/core/djangoapps/django_comment_common/comment_client/user.py

@@ -193,7 +193,7 @@ def _retrieve(self, *args, **kwargs):
         if course_id:
             course_id = str(course_id)
             retrieve_params['course_id'] = course_id
-        course_key = utils.get_course_key(course_id)
+        course_key = utils.get_course_key(course_id) or utils.get_course_key(kwargs.get("course_key"))
 
         if is_forum_v2_enabled(course_key):
             group_ids = [retrieve_params['group_id']] if 'group_id' in retrieve_params else []
@@ -207,6 +207,7 @@ def _retrieve(self, *args, **kwargs):
             try:
                 response = forum_api.get_user(**params)
             except ForumV2RequestError as e:
+                course_id = str(course_key)
                 self.save({"course_id": course_id})
                 response = forum_api.get_user(**params)
         else: