Null argument instead of array|object in searchSimilarTags() function

Problem/Motivation

Warning: foreach() argument must be of type array|object, null given in Drupal\ai_interpolator_openai\Plugin\AiInterPolatorFieldRules\OpenAiTaxonomy->searchSimilarTags()

Proposed resolution

Add a conditional if statement before the for loop to ensure that $data is not null.