Merge branch 'feature/courses' into dev

apps/course/views.py

@@ -57,7 +57,7 @@ def coursecomment(request, course_id):
                 'errors': ['Comment can not be empty']
             }, status=400)
 
-        if not reply_to:
+        if not int(reply_to):
             coursecomment = CourseComment.objects.create(
                 author=request.user,
                 content=comment,