Fixed mongo cursor not found
Fixed mongo cursor not found

EDUlib/cs_comments_service,EDUlib/cs_comments_service,edx/cs_comments_service,edx/cs_comments_service,edx/cs_comments_service,edx-solutions/cs_comments_service,EDUlib/cs_comments_service,edx-solutions/cs_comments_service,edx-solutions/cs_comments_service