Images in table cells with text wrapping without circulation, have an empty row in the cell below the image. To reduce this empty space you have to set the line spacing in the paragraph settings to the minimum.
This is always useful when you have a table cell with only the image and no text inside.
In my case, I had a long table with 2 columns and I wanted to interrupt the long table with an image here and there. Because the table cannot flow around images (my suggestion 2/22), I put in a new row, merged the two columns in this row and inserted an image. It had always the empty row below it like in the picture of my original post.
Example result (after reducing the line spacing):