Fix race condition while loading the contest submission page

[Virv12]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 53.90%. Comparing base (e586c7f) to head (32508f6).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
cms/server/admin/handlers/base.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1704   +/-   ##
=======================================
  Coverage   53.90%   53.90%           
=======================================
  Files         341      341           
  Lines       27985    27985           
=======================================
+ Hits        15084    15085    +1     
+ Misses      12901    12900    -1     

Flag	Coverage Δ
functionaltests	0.00% <0.00%> (ø)
unittests	53.90% <0.00%> (+<0.01%)	⬆️

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