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Change-Id: Ic2e3a6630c4b43748a52354fdad8dfb464956b12
wifi: fix NullPointerException when tethering is on and devices are connected

* When the Portable Wi-Fi hotspot is on, devices are connected to the
  hotspot, the list is being updated and the user decides to navigate
  back to the 'Tethering & portable hotspot' settings a NullPointer-
  Exception can occur due to getActivity() = null.
* Fix this by only updating the list if the activity exists.

  Logcat: https://gist.github.com/Skaveelicious/765d03172078a7657fb0

Change-Id: I34dcafe9286443220867399f22dccb75a4b40d38
Liquid Downloads: Update PAGapps link

Change-Id: Id4acb4e0ca84bbb1e9c22000d1cf8aa4f89a937c
Merge pull request #44 from LiquidSmooth/kitkat3

marge last Liquid pull request