Set points to 0 upon aborting a submission

[quantum5]

Also need to run the following python code to fix existing submissions:

Submission.objects.filter(status='AB').update(points=0)

[codecov-commenter]

Codecov Report

Merging #1528 into master will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1528   +/-   ##
=======================================
  Coverage   46.05%   46.05%           
=======================================
  Files         209      209           
  Lines       12059    12059           
=======================================
  Hits         5554     5554           
  Misses       6505     6505           

Impacted Files	Coverage Δ
judge/bridge/judge_handler.py	0.00% <0.00%> (ø)
judge/judgeapi.py	20.58% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 5122c10...728a72b. Read the comment docs.