fix: handle nullable nextPage behavior when searching albums #12401

Author: koukibadr

app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java

@@ -1067,7 +1067,7 @@ public void handleNextItems(final ListExtractor.InfoItemsPage<?> result) {
         infoListAdapter.addInfoItemList(result.getItems());
         nextPage = result.getNextPage();
 
-        if (!result.getErrors().isEmpty()) {
+        if (!result.getErrors().isEmpty() && nextPage != null) {
             showSnackBarError(new ErrorInfo(result.getErrors(), UserAction.SEARCHED,
                     "\"" + searchString + "\" → pageUrl: " + nextPage.getUrl() + ", "
                             + "pageIds: " + nextPage.getIds() + ", "