Fix the NPE in the Settings Tile lib

Move the key checker after ensureMetadataNotStale() since it might
update the key to null.

Bug: 286690307
Test: robotest
Change-Id: I6eaae2ca798d2deccea44137846fe9a4e294f26e
Merged-In: I6eaae2ca798d2deccea44137846fe9a4e294f26e
(cherry picked from commit f730153b58)

packages/SettingsLib/Tile/src/com/android/settingslib/drawer/Tile.java

@@ -284,10 +284,10 @@ public abstract class Tile implements Parcelable {
      * Optional key to use for this tile.
      */
     public String getKey(Context context) {
+        ensureMetadataNotStale(context);
         if (!hasKey()) {
             return null;
         }
-        ensureMetadataNotStale(context);
         if (mMetaData.get(META_DATA_PREFERENCE_KEYHINT) instanceof Integer) {
             return context.getResources().getString(mMetaData.getInt(META_DATA_PREFERENCE_KEYHINT));
         } else {