Prepare tests for impending robolectric merge

Some ShadowUserManager function moved into the basic shadow in
robolectric proper and has been removed from the Settings
ShadowUserManager.

Test: make -j56 RunSettingsRoboTests
Change-Id: I38647dae5d16bc79bc7925ca139c9362a2035393

src/com/android/settings/deviceinfo/imei/ImeiInfoDialogController.java

@@ -128,7 +128,7 @@ public class ImeiInfoDialogController {
     private SubscriptionInfo getSubscriptionInfo(Context context, int slotId) {
         final List<SubscriptionInfo> subscriptionInfoList = SubscriptionManager.from(context)
                 .getActiveSubscriptionInfoList();
-        if (subscriptionInfoList == null) {
+        if (subscriptionInfoList == null || subscriptionInfoList.isEmpty()) {
             return null;
         }