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Fix bug where card takes up additional space when empty, and show_empty is set to false #465

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@MrAdam MrAdam commented Sep 26, 2024

As title says, this fixes the issue mentioned in #433 where the card takes up additional whitespace when empty, and show_empty is set to false.

This works because the parent <div class="card"> element has the following CSS selector:

.card:has(> [hidden]) {
  display: none;
}

Inspiration for solving this was taken from the following card in the official repository:
https://github.com/home-assistant/frontend/blob/dev/src/panels/lovelace/cards/hui-markdown-card.ts

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