Articles without paragraphs should have a margin to item action as well. Fix this issue by adding the margin to the container element.
There must be no space between between the <div class="preview-full-content"> and the $item['content']. The CSS pseudo-class :empty does not consider a div with whitespaces only as empty. The Selectors Level 4 Draft[1] as of 13 September 2015, mentions the CSS pseudo-class :blank which will do so. But it's a draft and not yet implemented by the majority of the browsers.
[1] https://drafts.csswg.org/selectors-4/#the-blank-pseudo
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