Placeholders displaying when no metafields are present

Hi, I’m re-working my store with a 2.0 theme and metafields.

All fine, except for some products I don’t want to have metafields, so have left the field blank in the product pages.

However, on those products it seems there is a placeholder, like the them is forcing me to input data into the metafields. Specifically, an image placeholder if no image is chosen, and a text placeholder "F4F7FC

What I need is some some simple command like 'IF there’s no data in the metafields for the product, DO NOT display any placeholder"

I have been searching online but haven’t found the answer.

The theme is not yet live, but i’m using the Impulse theme by Archetype themes and they won’t help with coding (weird?!)

Please can anyone help?

Thank you in advance.