Warning about foreach in facets_exposed_filters_search_api_query_alter

Problem/Motivation

An object attribute $view->filter is used as the array in a foreach without checking if it is set. This resulted in the warning:

Warning: foreach() argument must be of type array|object, null given in facets_exposed_filters_search_api_query_alter() (line 49 of modules/contrib/facets/modules/facets_exposed_filters/facets_exposed_filters.module).

On line 49 you find

foreach ($view->filter as $filter) {

Steps to reproduce

1. Install facets and submodule facets_exposed_filters
2. Install search api and index taxonomy reference fields
3. Set facets as exposed filters on a view of display type block
4. Configure the view block to use exposed filters
5. Put an exposed filters block on a page

Proposed resolution

Add ?? operator to make sure the foreach has an array.

Remaining tasks

User interface changes

API changes

Data model changes