fix: avoid query issue caused by empty placeholder value

src/Repository/AssignmentRepository.php

@@ -345,13 +345,16 @@ class AssignmentRepository extends ServiceEntityRepository
                 $qb->expr()->in('assignment.jobProfile', ':jobProfiles'),
                 $qb->expr()->isNull('application'),
                 $qb->expr()->isNull('disposition'),
-                $qb->expr()->in('assignment.id', $availableAssignmentsIds)
             ))
             ->setParameter('staffingStatus', Assignment::STATUS_STAFFED)
             ->setParameter('jobProfiles', $teamer->getJobProfiles())
             ->setParameter('teamer', $teamer)
         ;
 
+        if ([] !== $availableAssignmentsIds) {
+            $qb->andWhere($qb->expr()->in('assignment.id', $availableAssignmentsIds));
+        }
+
         if (0 === $teamer->getTrainingAttendances()->count() && 0 === $teamer->getLicenses()->count()) {
             $qb
                 ->andWhere($qb->expr()->eq('job_profile.requiredLicenses', ':requiredLicenses'))