get_image_array image srcset fix

[jGRUBBS]

ensure image srcset is always a string

{"error":{"root_cause":[{"type":"mapper_parsing_exception","reason":"failed to parse field [featured_image.image.srcset] of type [boolean] in document with id '81538'"}],"type":"mapper_parsing_exception","reason":"failed to parse field [featured_image.image.srcset] of type [boolean] in document with id '81538'","caused_by":{"type":"illegal_argument_exception","reason":"Failed to parse value [https://d1fxo6mb5umqsa.cloudfront.net/wp-content/uploads/2024/05/16110759/Hero-300x167.jpg 300w, https://d1fxo6mb5umqsa.cloudfront.net/wp-content/uploads/2024/05/16110759/Hero-1024x569.jpg 1024w, https://d1fxo6mb5umqsa.cloudfront.net/wp-content/uploads/2024/05/16110759/Hero-768x426.jpg 768w, https://d1fxo6mb5umqsa.cloudfront.net/wp-content/uploads/2024/05/16110759/Hero-1536x853.jpg 1536w, https://d1fxo6mb5umqsa.cloudfront.net/wp-content/uploads/2024/05/16110759/Hero-2048x1137.jpg 2048w] as only [true] or [false] are allowed."}},"status":400}

Before this fix, image srcset could be a boolean.

Addresses

• kingandpartners/nemacolin#2480