Skipping serialization of fields in Contact (#20)

Reviewed-on: phoenix/textsender-models#20

src/lib.rs

@@ -6,7 +6,10 @@ pub mod token;
 pub mod user;
 
 pub mod init {
-    pub fn is_uuid_nil(uuid: &uuid::Uuid) -> bool {
-        uuid.is_nil()
+    pub fn is_uuid_nil(uuid: &Option<uuid::Uuid>) -> bool {
+        match uuid {
+            Some(id) => id.is_nil(),
+            None => true,
+        }
     }
 }