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

telephony/java/android/telephony/euicc/EuiccManager.java

@@ -291,7 +291,7 @@ public class EuiccManager {
     public boolean isEnabled() {
         // In the future, this may reach out to IEuiccController (if non-null) to check any dynamic
         // restrictions.
-        return getIEuiccController() != null;
+        return getIEuiccController() != null && mCardId != TelephonyManager.INVALID_CARD_ID;
     }
 
     /**