Hey @armean, welcome!
Maybe this thread will help you: Show a default image if no image exists in the database - Wappler General / How To - Wappler Community
Also, what i’ve done in the past (not the best practice but still, it’s working 
) is adding two images with a show/hide condition.
If this image existe, then show this block.
if this image doesn’t exist, then show this one.
