Allow an authinfo search with no username : we can add authinfo with no...

Allow an authinfo search with no username : we can add authinfo with no username so a search without it should return result.

liblinphone!2378

liblinphone

-Subproject commit 738464c21242202242f713af52b0b59576c5d6bc
+Subproject commit 1c3e1ca0d7cf5192d0c82bfa320296ee0f16b037