Fix NPE because of null animation in CallCardFragment.

Bug: 15448134
Change-Id: Iaf61864720b2398ca2cd883fd8058dd71f7b7334
diff --git a/InCallUI/src/com/android/incallui/CallCardFragment.java b/InCallUI/src/com/android/incallui/CallCardFragment.java
index 02f70db..557331f 100644
--- a/InCallUI/src/com/android/incallui/CallCardFragment.java
+++ b/InCallUI/src/com/android/incallui/CallCardFragment.java
@@ -304,7 +304,10 @@
                 mCallStateLabel.startAnimation(mPulseAnimation);
             }
         } else {
-            mCallStateLabel.getAnimation().cancel();
+            Animation callStateAnimation = mCallStateLabel.getAnimation();
+            if (callStateAnimation != null) {
+                callStateAnimation.cancel();
+            }
             mCallStateLabel.setAlpha(0);
             mCallStateLabel.setVisibility(View.GONE);
         }