Updated more usages of InfoItemsPage#getNextPage. Nullability is already handled in these areas so no other changes needed

Author: HatakeKakashri

app/src/main/java/org/schabi/newpipe/fragments/list/BaseListInfoFragment.java

@@ -8,6 +8,7 @@
 import android.view.View;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import com.evernote.android.state.State;
 
@@ -42,6 +43,7 @@ public abstract class BaseListInfoFragment<I extends InfoItem, L extends ListInf
 
     private final UserAction errorUserAction;
     protected L currentInfo;
+    @Nullable
     protected Page currentNextPage;
     protected Disposable currentWorker;
 

app/src/main/java/org/schabi/newpipe/player/playqueue/AbstractInfoPlayQueue.java

@@ -3,6 +3,7 @@
 import android.util.Log;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import org.schabi.newpipe.extractor.InfoItem;
 import org.schabi.newpipe.extractor.ListExtractor;
@@ -23,6 +24,7 @@ abstract class AbstractInfoPlayQueue<T extends ListInfo<? extends InfoItem>>
 
     final int serviceId;
     final String baseUrl;
+    @Nullable
     Page nextPage;
 
     private transient Disposable fetchReactor;