Fix the license checker after elemental.json #15383

The elemental.json update changed how null values and string
representations of numbers were parsed, which caused a lot of
tests for CvalChecker to fail. Unfortunately the tests were
never run in an automated fashion, which means that they were
never discovered until we stumbled upon it due to the issue
reported in #15383

Change-Id: If2cb9fa96effea7ce55a4ffe6d1666ca7521e1fb