Describe the bug
From the TA grading page, clicking on "statistics & charts" we can view an overall histogram of the student grades for that gradeable.

We can use edit filters to include/exclude students who are in the NULL section (dropped the course) and similarly students who are withdrawn.

While toggling include for these options changes the number of students & the average & other stats on the grade details page, it does not remove these students from the histogram. The histogram is identical before & after even though there are multiple students who submitted the assignment & were graded who are in NULL section and or withdrawn.

Expected behavior
These filters are new, so I guess the code that does the plots needs to be updated to pay attention to the filters.