Verify shoppingPersistedTabData not null before calling its method

Bug: 1162451
Change-Id: I568b095600b8268bc461e0c02ec918cb1e6dcc91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606352Reviewed-by: David Maunder <davidjm@chromium.org>
Reviewed-by: Yue Zhang <yuezhanggg@chromium.org>
Commit-Queue: Zhiyuan Cai <zhiyuancai@google.com>
Cr-Commit-Position: refs/heads/master@{#839767}

chrome/android/features/tab_ui/java/src/org/chromium/chrome/browser/tasks/tab_management/TabGridViewBinder.java

@@ -223,7 +223,8 @@ class TabGridViewBinder {
             if (model.get(TabProperties.SHOPPING_PERSISTED_TAB_DATA_FETCHER) != null) {
                 model.get(TabProperties.SHOPPING_PERSISTED_TAB_DATA_FETCHER)
                         .fetch((shoppingPersistedTabData) -> {
-                            if (shoppingPersistedTabData.getPriceDrop() == null) {
+                            if (shoppingPersistedTabData == null
+                                    || shoppingPersistedTabData.getPriceDrop() == null) {
                                 priceCardView.setVisibility(View.GONE);
                                 model.set(TabProperties.PRICE_DROP, null);
                             } else {