add non_atomic_requests decorator to handle_xblock_callback so we can query student's grade from xblock
add non_atomic_requests decorator to handle_xblock_callback so we can query student's grade from xblock

cognitiveclass/edx-platform,cognitiveclass/edx-platform,bigdatauniversity/edx-platform,cognitiveclass/edx-platform,bigdatauniversity/edx-platform,bigdatauniversity/edx-platform,bigdatauniversity/edx-platform,cognitiveclass/edx-platform,cognitiveclass/edx-platform,bigdatauniversity/edx-platform