Check for cursor closed.

The framework became stricter in MR0, so even though this is a rare
issue it could still crash our app. This CL should take care of that

Bug:5449584
Change-Id: I7f5bb5042e49bd713967ef9e01947cd6d4fdb487
diff --git a/src/com/android/contacts/list/ContactTileAdapter.java b/src/com/android/contacts/list/ContactTileAdapter.java
index 8de7fd5..782d7c1 100644
--- a/src/com/android/contacts/list/ContactTileAdapter.java
+++ b/src/com/android/contacts/list/ContactTileAdapter.java
@@ -276,7 +276,7 @@
 
     @Override
     public int getCount() {
-        if (mContactCursor == null) {
+        if (mContactCursor == null || mContactCursor.isClosed()) {
             return 0;
         }