Revert "[BB-873] Support for filters, and multiple roots in problem response reports"

[DawoudSheraz]

Reverts edx/edx-platform#19781 as with the merge of that PR, the problem response CSV is broken, with the following error(confirmed locally and at the stage):

edx.devstack.lms     |   File "/edx/app/edxapp/venvs/edxapp/local/lib/python2.7/site-packages/celery/app/trace.py", line 240, in trace_task
edx.devstack.lms     |     R = retval = fun(*args, **kwargs)
edx.devstack.lms     |   File "/edx/app/edxapp/edx-platform/lms/djangoapps/instructor_task/tasks.py", line 177, in calculate_problem_responses_csv
edx.devstack.lms     |     return run_main_task(entry_id, task_fn, action_name)
edx.devstack.lms     |   File "/edx/app/edxapp/edx-platform/lms/djangoapps/instructor_task/tasks_helper/runner.py", line 116, in run_main_task
edx.devstack.lms     |     task_progress = task_fcn(entry_id, course_id, task_input, action_name)
edx.devstack.lms     |   File "/edx/app/edxapp/edx-platform/lms/djangoapps/instructor_task/tasks_helper/grades.py", line 778, in generate
edx.devstack.lms     |     usage_key_str_list=problem_locations.split(','),
edx.devstack.lms     | AttributeError: 'NoneType' object has no attribute 'split'

Here is a screenshot from the Splunk for stage error:

[edx-status-bot]

Your PR has finished running tests. There were no failures.

[noraiz-anwar]

👍

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production on Friday, August 09, 2019.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.