Avoid showing nulls in location string and add Telegram button
Summary:
Fix problem showed by Marco
Fixes T1087
Solves T1082
Reviewers: valerio.bozzolan
Reviewed By: valerio.bozzolan
Subscribers: valerio.bozzolan, Libre BusTO
Tags: Libre BusTO
Maniphest Tasks: T1087
Differential Revision: https://gitpull.it/D93