Fix NPE where CellLayout is null when removing item out of folder

Fix: 282249989
Test: create a folder of 2 app icons, remove one icon out of folder, no crash
Change-Id: I3c132ec8833c7cb14066cc403c0641d089bab8ab

src/com/android/launcher3/folder/LauncherDelegate.java

@@ -94,6 +94,9 @@ public class LauncherDelegate {
                         // folder
                         CellLayout cellLayout = mLauncher.getCellLayout(info.container,
                                 info.screenId);
+                        if (cellLayout == null) {
+                            return;
+                        }
                         finalItem =  info.contents.remove(0);
                         newIcon = mLauncher.createShortcut(cellLayout, finalItem);
                         mLauncher.getModelWriter().addOrMoveItemInDatabase(finalItem,