Fix: Job Schedule job release task null error

[timotheeguerin]

fix #1978

[codecov]

Codecov Report

Merging #1979 into stable will increase coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           stable   #1979      +/-   ##
=========================================
+ Coverage   64.54%   64.9%   +0.36%     
=========================================
  Files        1012    1013       +1     
  Lines       27693   27699       +6     
  Branches     4930    4934       +4     
=========================================
+ Hits        17874   17978     +104     
+ Misses       9803    9705      -98     
  Partials       16      16

Impacted Files	Coverage Δ
...etails/job-schedule-job-specification.component.ts	100% <0%> (ø)
src/app/models/job-release-task.ts	100% <0%> (+10%)	⬆️
...ponents/job/details/job-configuration.component.ts	78.37% <0%> (+59.45%)	⬆️
src/app/decorators/job-decorator.ts	61.53% <0%> (+61.53%)	⬆️
...pp/decorators/task-container-settings-decorator.ts	100% <0%> (+100%)	⬆️
src/app/decorators/job-execution-info-decorator.ts	100% <0%> (+100%)	⬆️
...c/app/decorators/job-preparation-task-decorator.ts	100% <0%> (+100%)	⬆️
src/app/decorators/task-constraints-decorator.ts	100% <0%> (+100%)	⬆️
src/app/decorators/job-release-task-decorator.ts	100% <0%> (+100%)	⬆️
src/app/decorators/job-manager-task-decorator.ts	100% <0%> (+100%)	⬆️
... and 1 more

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