How to display posts by vote count and if no value continue with latest posts with no votes?

The “orderby” parameter takes a fallback value, and here you want to get the posts sorted by post date when the vote value is not available. so you can just append “date” to the orderby parameter like below to get the rest of the post in the loop sorted as per the dates:–

'orderby' => 'meta_value_num date',

For more details check the Codex

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