[calls] contacts-provider: Don't throw a critical when trying to lookup NULL id

[Evangelos Ribeiro Tzaras <devrtz src gnome org>]

commit 9ffcbe2de8ce4a079c2761c3c9e3cf32e5099aa7
Author: Evangelos Ribeiro Tzaras <devrtz fortysixandtwo eu>
Date:   Thu Feb 17 11:08:41 2022 +0100

    contacts-provider: Don't throw a critical when trying to lookup NULL id
    
    Anonymous callers will show up with a NULL id, so don't emit a critical here.
    
    Fixes 006673a9e1a18d5a4ddbf4ad2bd04b935396ac2a

 src/calls-contacts-provider.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/src/calls-contacts-provider.c b/src/calls-contacts-provider.c
index 41faeb2c..5bd1818d 100644
--- a/src/calls-contacts-provider.c
+++ b/src/calls-contacts-provider.c
@@ -441,7 +441,9 @@ calls_contacts_provider_lookup_id (CallsContactsProvider *self,
   g_autoptr (CallsBestMatch) best_match = NULL;
 
   g_return_val_if_fail (CALLS_IS_CONTACTS_PROVIDER (self), NULL);
-  g_return_val_if_fail (id, NULL);
+
+  if (!id || !*id)
+    return NULL;
 
   best_match = g_hash_table_lookup (self->best_matches, id);