Add log to help debug crash during bindItems.

Bug: 198115560
Test: can't repo, need to catch in wild
Change-Id: I9d457fce4903c5df33833a5e4817f8a32ed260e2
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index bed4fa9..b1672e3 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -2366,6 +2366,9 @@
                 CellLayout cl = mWorkspace.getScreenWithId(item.screenId);
                 if (cl != null && cl.isOccupied(item.cellX, item.cellY)) {
                     View v = cl.getChildAt(item.cellX, item.cellY);
+                    if (v == null) {
+                        Log.e(TAG, "bindItems failed when removing colliding item=" + item);
+                    }
                     Object tag = v.getTag();
                     String desc = "Collision while binding workspace item: " + item
                             + ". Collides with " + tag;