If there is no text description for an image, what needs to be used as a substitute?

Hi Team,

Have a quick question. If there is no text description for an image, if I want to create text embeddings using OpenAI CLIP, should I be using nulls, empty strings, whitespaces or other methods as a substitute so the model will learn well on those embeddings?

Thank you!

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I have no idea, but pushing it just in case anyone else knows.