conversation: contact added
conversation: contact added

- fix possible crash when trying to access uri of contact that
is not in the contact list
- save TEMPORARY contact after receiving daemon signal contact added

Change-Id: I55873c609717932b9e8ed94ed11f9f72b9db76c3
Gitlab: #431

savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc,savoirfairelinux/ring-lrc