Add a developer comment for a potentially alarming log message

Change-Id: I652c88b899bb64c5886e3e0fc2db46d1132dee96
diff --git a/src/com/android/mail/providers/Account.java b/src/com/android/mail/providers/Account.java
index 1474b9a..b9d46a8 100644
--- a/src/com/android/mail/providers/Account.java
+++ b/src/com/android/mail/providers/Account.java
@@ -438,6 +438,7 @@
         syncAuthority = cursor.getString(
                 cursor.getColumnIndex(AccountColumns.SYNC_AUTHORITY));
         if (TextUtils.isEmpty(syncAuthority)) {
+            // NOTE: this is actually expected in Email for the "combined view" account only
             LogUtils.e(LOG_TAG, "Unexpected empty syncAuthority from cursor");
         }
         quickResponseUri = Utils.getValidUri(cursor.getString(