Don't send contacts request if list of contacts is null
Fixes crash 28
fixed local conversion crash, just return 0 if rate or btcvalue are null
fixes crash 21
Added error handling for bad bitcoin requests
(fixes crash 23)
fix for welcome activity not running error
(crash 24)
fix for welcome activity when displaying error during finishing
(crash 32)
stopped using setRetainInstance(true) on fragments
hopefully fixes Crash 25
guard against all invalid contact ids
Fixes Crash 41
added a null check when dismissing sendfragment context menu
(Hopefully fixes Crash 35)
check if fragment is added to activity on transaction list click
fixes crash 26