Philip Withnall authored Sep 17, 2010 and Philip Withnall committed Nov 13, 2010

It was not possible for it to ever be thrown (since TpContact.get_identifier()
is guaranteed to always return a valid ID, and having *_new() methods throw
exceptions is never a good idea. (GInitable should be used instead.)

This breaks both the Vala and C APIs.

Helps: bgo#629078