The default ReplyFromAccount in Gmail has null 'name'

b/12434353

Change-Id: Ifc94570c72b5d2952cedb01945029855b0a05e89
diff --git a/src/com/android/mail/providers/ReplyFromAccount.java b/src/com/android/mail/providers/ReplyFromAccount.java
index 875d22e..0916208 100644
--- a/src/com/android/mail/providers/ReplyFromAccount.java
+++ b/src/com/android/mail/providers/ReplyFromAccount.java
@@ -81,7 +81,7 @@
         try {
             Uri uri = Utils.getValidUri(json.getString(BASE_ACCOUNT_URI));
             String addressString = json.getString(ADDRESS_STRING);
-            String nameString = json.getString(NAME_STRING);
+            String nameString = json.optString(NAME_STRING, null);
             String replyTo = json.getString(REPLY_TO);
             boolean isDefault = json.getBoolean(IS_DEFAULT);
             boolean isCustomFrom = json.getBoolean(IS_CUSTOM_FROM);