fix: fixed crash when caster array was empty

[TeddyRoncin]

Fix crash when no caster was passed to route PATCH /admin/tournaments/:tournamentId

Changes

Now the request.body.casters is always set to undefined, before it could still be equal to [] after adding casters (if there were none)

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (89a5319) 96.36% compared to head (6cae626) 96.36%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #161   +/-   ##
=======================================
  Coverage   96.36%   96.36%           
=======================================
  Files         110      110           
  Lines        2338     2338           
  Branches      333      333           
=======================================
  Hits         2253     2253           
  Misses         47       47           
  Partials       38       38           

Files	Coverage Δ
.../controllers/admin/tournaments/updateTournament.ts	95.83% <100.00%> (ø)

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