Car owners who received letters from a collection agency, demanding they pay parking fees they say they do not owe, lack a case under the Fair Debt Collection Practices Act, a federal judge has ruled. In a written opinion, U.S. District Judge Edmond E. Chang held that the money a collection agency sought from each owner — the $1.50 underlying parking fee and an additional $45 for purportedly failing to pay that fee — isn’t a debt under the FDCPA. And because the $46.50 doesn’t constitute a …