Lovelace: Remove margin from conditional if not shown #1730
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A conditional card which is currently showing no content may still have margins (e.g. if placed in a vertical-stack.
Example:
![conditional fix](https://user-images.githubusercontent.com/1299821/46434002-a25c3e00-c752-11e8-9f58-cea80f5ebc5f.png)
Notice how the curenly hidden conditional in the right column leaves an empty space (marked with red).
This change sets the margin to 0 if the card is currently not showing.
This is not a fix for #1686.