Fix potential Dialer NPEs

Fix NPEs encountered during monkey tests

Bug: 21167534
Change-Id: I98b6f675adfd233d3583c363f7daeca1bc14d8b7
diff --git a/src/com/android/dialer/DialtactsActivity.java b/src/com/android/dialer/DialtactsActivity.java
index 25828e5..56d5ad1 100644
--- a/src/com/android/dialer/DialtactsActivity.java
+++ b/src/com/android/dialer/DialtactsActivity.java
@@ -721,7 +721,7 @@
      * @see #commitDialpadFragmentHide
      */
     public void hideDialpadFragment(boolean animate, boolean clearDialpad) {
-        if (mDialpadFragment == null) {
+        if (mDialpadFragment == null || mDialpadFragment.getView() == null) {
             return;
         }
         if (clearDialpad) {