An Iranian woman has been arrested after a photograph of her eating at a restaurant without the government-mandated headscarf went viral. The picture showed two unveiled women sitting in an Iranian restaurant in Tehran – one was identified as Donya Rad and the other a friend of hers who has not been named. “Yesterday after this photo was published, the security agencies contacted my sister Donya Rad and asked her to give some explanations,” her sister Dina tweeted after the photo went viral. “Today, after going where she was told, she was arrested. After a few hours of silence, Donya told me i…