Null check; back behavior

Since its possible there was no chip formed for an address, it is
possible there is no address in some part of the inAddresses array, so
build it up as an arraylist so we don't have null spots.

Fixes b/6555471 NPE in com.android.ex.chips.RecipientAlternatesAdapter.getMatchingRecipients

Fixes b/6556107 when contact chip is selected back button should dismiss the popup and unselct the chip
Change-Id: If74b13ccc5f51aafc3638817b5fbef54cd57548c