Merge "Fix NPE when converting final screen to empty screen." into sc-qpr1-dev am: 70dd01be85

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15583988

Change-Id: I436611efcf40cb7e5311a1ff4b0ed79635114e29
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 5bdc402..2bb4e5c 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -687,8 +687,9 @@
         CellLayout finalScreen = mWorkspaceScreens.get(finalScreenId);
 
         // If the final screen is empty, convert it to the extra empty screen
-        if (finalScreen.getShortcutsAndWidgets().getChildCount() == 0 &&
-                !finalScreen.isDropPending()) {
+        if (finalScreen != null
+                && finalScreen.getShortcutsAndWidgets().getChildCount() == 0
+                && !finalScreen.isDropPending()) {
             mWorkspaceScreens.remove(finalScreenId);
             mScreenOrder.removeValue(finalScreenId);