Don't show a custom description if any transformation fail.

That could result in an inconsistent, confusing UI. For example, if the
successfully description for a credit card was "Exp. date: 04/20", one with a
failure could be "Exp. date: /20" - it's better to not show a custom description
in these cases.

Test: CtsAutoFillServiceTestCases pass
Test: CustomDescriptionTest.failFirstFailAll
Test: CustomDescriptionTest.failSecondFailAll

Bug: 62534917

Change-Id: I6554e3470ead2f84d7ef8715192d863c01ab1190