Avoid NPE by checking

Bug: 11956240
Change-Id: I3de1ebbf96fa2422124e4d8e50190adfa09b8a49
diff --git a/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java b/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java
index 7d307a4..2cee130 100644
--- a/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java
+++ b/java/src/com/android/inputmethod/latin/settings/SettingsFragment.java
@@ -71,6 +71,9 @@
         // Because the "%s" summary trick of {@link ListPreference} doesn't work properly before
         // KitKat, we need to update the summary programmatically.
         final ListPreference listPreference = (ListPreference)findPreference(prefKey);
+        if (listPreference == null) {
+            return;
+        }
         final CharSequence entries[] = listPreference.getEntries();
         final int entryIndex = listPreference.findIndexOfValue(listPreference.getValue());
         listPreference.setSummary(entryIndex < 0 ? null : entries[entryIndex]);