Don't replace phone number text if formatted number is null.

Bug: 11734577
Change-Id: I21e11b9aed0dde06f96fcbdcc605cef0f2c4120f
diff --git a/src/com/android/contacts/common/list/ContactListItemView.java b/src/com/android/contacts/common/list/ContactListItemView.java
index 0217620..292e63a 100644
--- a/src/com/android/contacts/common/list/ContactListItemView.java
+++ b/src/com/android/contacts/common/list/ContactListItemView.java
@@ -1028,7 +1028,10 @@
             getDataView();
 
             if (countryIso != null) {
-                text = PhoneNumberUtils.formatNumber(text, countryIso);
+                String formattedText = PhoneNumberUtils.formatNumber(text, countryIso);
+                if (formattedText != null) {
+                    text = formattedText;
+                }
             }
 
             // Sets phone number texts for display after highlighting it, if applicable.