Hi! Thanks for making an awesome tool!!

When I use grid and I don't have an image, the image box comes up as gray. I know I can set a default image, but I don't want to do that. I'd like the grid card to just hide the image portion of the image isn't supplied. 

This could be a good _index.qmd specification perhaps?

![image](https://user-images.githubusercontent.com/18710907/175355945-0235aca1-84fb-4cf3-a702-29fe10362924.jpeg)
dragonstyle
2022-06-23T17:12:22Z
bryanwhiting
Future
open
Hide image display if not in front matter on grid display
https://github.com/quarto-dev/quarto-cli/issues/1213