fix: preservation job error on button when leave edit mode

src/app/features/preservation/job/components/routables/job-detail-edit/job-detail-edit.routable.ts

@@ -75,7 +75,7 @@ export class JobDetailEditRoutable extends SharedAbstractDetailEditCommonRoutabl
         icon: "play_arrow",
         labelToTranslate: TRANSLATE("preservation.jobExecution.button.start"),
         callback: () => this.jobExecutionList.start(),
-        displayCondition: (resource) => resource && (resource.jobRecurrence !== JobRecurrenceEnum.ONCE || !this.jobExecutionList.atLeastOneExecution),
+        displayCondition: (resource) => resource && (resource.jobRecurrence !== JobRecurrenceEnum.ONCE || (this.jobExecutionList && !this.jobExecutionList.atLeastOneExecution)),
         order: 31,
       },
       {