Protect against null carrier config

Change-Id: Ida60ead4a85017c29cc8ad3c3e7a462a9e3c720b
Fixes: 28085042
diff --git a/src/com/android/settings/DeviceInfoSettings.java b/src/com/android/settings/DeviceInfoSettings.java
index 19c4a3f..dd8064f 100644
--- a/src/com/android/settings/DeviceInfoSettings.java
+++ b/src/com/android/settings/DeviceInfoSettings.java
@@ -283,7 +283,7 @@
             CarrierConfigManager configManager =
                     (CarrierConfigManager) getSystemService(Context.CARRIER_CONFIG_SERVICE);
             PersistableBundle b = configManager.getConfig();
-            if (b.getBoolean(CarrierConfigManager.KEY_CI_ACTION_ON_SYS_UPDATE_BOOL)) {
+            if (b != null && b.getBoolean(CarrierConfigManager.KEY_CI_ACTION_ON_SYS_UPDATE_BOOL)) {
                 ciActionOnSysUpdate(b);
             }
         }