Union Berlin caused a stir on social media with a joke about a Dresden bridge collapse – but apologized later. A section of the Carola Bridge over the Elbe river collapsed in Dresden early on Wednesday but nobody was injured. On Friday, another section collapsed during demolition work. Dresden is in the same state – Saxony – as RB Leipzig. Union drew 0-0 there on Saturday. “Half an hour gone. Defensively more stable than any Saxon bridge. Keep it up, lads!” Union wrote on X. Almost two hours later, the Berliners apologized to the city of Dresden, explaining that the comment had been “a bit ove…