Appealing from a final judgment for U.S. Bank in a mortgage foreclosure case, Mario A. and Martha D. Lopez argued the trial judge erred in striking their affirmative defense that the bank lacked standing to sue. This defense was based on a missing link in the chain of endorsements for the promissory note attached to the original complaint.U.S. Bank, which sued as “owner trustee for Queen’s Park Oval Asset Holding Trust,” alleged it was “legal holder” of the note and mortgage. But neither U.S …