When validating the term id filter allow an identifier that are is not an array

Problem/Motivation

I am getting the following error when used Better Exposed Filter and Grouped Filter with checkbox. Warning: Invalid argument supplied for foreach() in Drupal\taxonomy\Plugin\views\filter\TaxonomyIndexTid->validateExposed() (line 365 of core/modules/taxonomy/src/Plugin/views/filter/TaxonomyIndexTid.php)

Steps to reproduce

Create a view and add an exposed filter (Term field or EntityReference Field) with Grouped Filter option and set Better Exposed Filter for the same field as Single On/Off Checkbox as screenshot attached. Now you will see the checkbox option on the page and when you select the checkbox and submit the form, will cause the error.

Proposed resolution

Check that $values is an array before passing it to the foreach()