commit f894832e415f506b83eba61ea65bc6e683aacd58
author Jack Yu <jackyu@google.com> Mon Dec 11 15:35:45 2017 -0800
committer Jack Yu <jackyu@google.com> Tue Dec 12 13:58:08 2017 -0800
tree f44a85482f2be68bdff8ed567c9862c3433f0ed5
parent 822d1fd0296a6aaf9e5fd3b5420db4779723130e

Fixed empty dns not properly handled issue

1. The original code was not moved correctly when moved
   from data call response into data connection in ag/3296869.
2. Removed the unnecessary stack trace print.
3. Added a new unit test to cover empty dns case.

Test: Unit tests + Telephony sanity tests.
bug: 70506433
Merged-In: Id95304705d3fd0560c0104621c407ad9f8f1148c
Change-Id: Id95304705d3fd0560c0104621c407ad9f8f1148c
(cherry picked from commit 5a9a6b847f268adf37e41f74a755c8c8f8661cc2)