Fix call stats NPE

* There is already code to handle the case where thirdIntent is null
  without potentially derefering a null UI element. Use it.

Change-Id: I51e373d8108ba50f3843b42d188f2ad26ca3fb60
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Dialer into android-4.4