Add null check for EuiccManager

Bug: 310710841
Test: it builds
Change-Id: Ib2966af74300223f7fd2306ad09504b941576f15
diff --git a/src/com/android/phone/euicc/EuiccUiDispatcherActivity.java b/src/com/android/phone/euicc/EuiccUiDispatcherActivity.java
index 5da52d6..3e44062 100644
--- a/src/com/android/phone/euicc/EuiccUiDispatcherActivity.java
+++ b/src/com/android/phone/euicc/EuiccUiDispatcherActivity.java
@@ -113,7 +113,7 @@
     @Nullable
     Intent resolveEuiccUiIntent() {
         EuiccManager euiccManager = (EuiccManager) getSystemService(Context.EUICC_SERVICE);
-        if (!euiccManager.isEnabled()) {
+        if (euiccManager == null || !euiccManager.isEnabled()) {
             Log.w(TAG, "eUICC not enabled");
             return null;
         }