Fix some bug

app/src/leanback/java/com/fongmi/android/tv/ui/activity/DetailActivity.java

@@ -253,6 +253,7 @@ public class DetailActivity extends BaseActivity implements KeyDown.Listener {
         for (int i = 0; i < mFlagAdapter.size(); i++) ((Vod.Flag) mFlagAdapter.get(i)).toggle(mCurrent == i, item);
         mEpisodeAdapter.notifyArrayItemRangeChanged(0, mEpisodeAdapter.size());
         mHandler.post(() -> mBinding.episode.setSelectedPosition(getEpisodePosition()));
+        if (mEpisodeAdapter.size() == 0) return;
         getPlayer(false);
     }
 

app/src/main/java/com/fongmi/android/tv/utils/Json.java

@@ -24,6 +24,7 @@ public class Json {
     }
 
     public static JsonObject safeObject(JsonElement element) {
+        if (element.getAsString().isEmpty()) return null;
         if (element.isJsonObject()) return element.getAsJsonObject();
         else if (element.isJsonPrimitive()) return JsonParser.parseString(element.getAsJsonPrimitive().getAsString()).getAsJsonObject();
         return null;