Fixing a crash on APPS->WORKSPACE transition when animation is automated without dragging.
b/29424335

Change-Id: I2b109423b5a4cfc94fcda75fdea936785373968f
diff --git a/src/com/android/launcher3/Hotseat.java b/src/com/android/launcher3/Hotseat.java
index 9f86a0b..5245509 100644
--- a/src/com/android/launcher3/Hotseat.java
+++ b/src/com/android/launcher3/Hotseat.java
@@ -218,4 +218,13 @@
             mBackgroundColor = color;
         }
     }
+
+    public void setBackgroundTransparent(boolean enable) {
+        // This causes re-layout. Should replace the logic with simply setting the background alpha
+        if (enable) {
+            setBackground(null);
+        } else {
+            setBackground(mBackground);
+        }
+    }
 }