Check whether cardId is valid in EuiccManager#isEnabled.

EuiccManager#isEnabled should be only true if its cardId is a valid one.

Bug: 111614811
Test: test on phone
Change-Id: I7b63d3e117a1bd1eb17dab8e1a7b1dfec1a8abe8
Merged-In: I7b63d3e117a1bd1eb17dab8e1a7b1dfec1a8abe8
1 file changed