[5.x] Improve checks for emptiness in productlist#1312
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Jade-GG wants to merge 3 commits into
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When given an empty productlist, you get an error because
entity_id:()is not a valid filter in elasticsearch.The original check only checked for empty arrays in PHP. With this PR I've added a check for js arrays, and also for any iterable (for example, collections didn't work properly either)