improvement: resize image placeholder for missing images

[francescosoave]

Hello, when I open an article without internet connection, the text loads but the images don't. That's fine but the image placholder is taking a huge amount of screen space (See image below) requiring user to scroll down a lot (this happens obviously for each image).
If possible I think it'd be better to make it so that if an image can't be loaded the placeholder is forced to a minimum size.
In the image below I have to scroll 4-5 times to go over that missing image.

thanks

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