Fixed some PHPStan level 5 issues

src/DataTables/Filters/Constraints/EntityConstraint.php

@@ -96,6 +96,7 @@ class EntityConstraint extends AbstractConstraint
 
     /**
      * Checks whether the constraints apply to a structural type or not
+     * @phpstan-assert-if-true AbstractStructuralDBElement $this->value
      */
     public function isStructural(): bool
     {

src/DataTables/ProjectBomEntriesDataTable.php

@@ -95,6 +95,8 @@ class ProjectBomEntriesDataTable implements DataTableTypeInterface
                         }
                         return $tmp;
                     }
+
+                    //@phpstan-ignore-next-line
                     throw new \Exception('This should never happen!');
                 },
             ])