Fix NPE in CandidateView.offsetMargin

Bug: 4609124
Change-Id: I14913afba80732e6beb8458b404001798a221a79
diff --git a/java/src/com/android/inputmethod/latin/CandidateView.java b/java/src/com/android/inputmethod/latin/CandidateView.java
index 5ef1d75..481092c 100644
--- a/java/src/com/android/inputmethod/latin/CandidateView.java
+++ b/java/src/com/android/inputmethod/latin/CandidateView.java
@@ -363,6 +363,8 @@
     }
 
     private static void offsetMargin(View v, int dx, int dy) {
+        if (v == null)
+            return;
         ViewGroup.LayoutParams lp = v.getLayoutParams();
         if (lp instanceof ViewGroup.MarginLayoutParams) {
             ViewGroup.MarginLayoutParams mlp = (ViewGroup.MarginLayoutParams)lp;