Warning: foreach() argument must be of type array|object, null given in SolrSearch->getFacetsData()

Problem/Motivation

When executing a solrSearch query, a warning appears: Warning: foreach() argument must be of type array|object, null given in Drupal\graphql_search_api_solr\Plugin\GraphQL\DataProducer\SearchApi\SolrSearch->getFacetsData() (Line 208 in graphql_search_api_solr/src/Plugin/GraphQL/DataProducer/SearchApi/SolrSearch.php)

Steps to reproduce

Execute any solrSearch query without using facets at all.

Proposed resolution

See Patch/MR

Remaining tasks

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User interface changes

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API changes

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Data model changes

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