[Merge] lp:~kai-mast/friends-app/leaks into lp:friends-app

[Kai Mast]

Kai Mast has proposed merging lp:~kai-mast/friends-app/leaks into lp:friends-app.

Requested reviews:
  Super Friends (super-friends)

For more details, see:
https://code.launchpad.net/~kai-mast/friends-app/leaks/+merge/203499

This branch fixes/disables a warning when friends-app is built (not sure if this function is even still needed though).

Also m_view was overwritten by a local variable, so there could be a memory leak. 

Finally, I did some cleanup of the coding style and removed the nullpointer check (delete nullptr; is a valid operation in C++, you don't have to check explicitly). 
-- 
https://code.launchpad.net/~kai-mast/friends-app/leaks/+merge/203499
Your team Super Friends is requested to review the proposed merge of lp:~kai-mast/friends-app/leaks into lp:friends-app.
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