Allow rejudging when there is only a single judge

[Ninjaclasher]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1902 (292122e) into master (03c91d2) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #1902   +/-   ##
=======================================
  Coverage   46.25%   46.25%           
=======================================
  Files         231      231           
  Lines       13045    13045           
=======================================
  Hits         6034     6034           
  Misses       7011     7011           

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

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