Citing a lack of evidence, a federal judge in Florida on Thursday dismissed terrorism support and conspiracy charges against the younger of two Muslim clerics accused of funneling thousands of dollars to the Pakistani Taliban. Judge Robert N. Scola Jr. of the United District Court for the Southern District of Florida ruled that “no rational trier of fact” could convict Izhar Khan, 26, who is an imam at a mosque in suburban Margate, north of Fort Lauderdale. The case against Mr. Khan’s father, Hafiz, 77, is continuing. Prosecutors said Hafiz Khan orchestrated the sending of about $50,000 to the Pakistani Taliban between 2008 and 2010.