🦺 Simplify handling of <listen> elements

src/config.rs

@@ -49,8 +49,8 @@ pub struct BusConfig {
     /// Address(es) that the bus should listen on.
     /// The address is in the standard D-Bus format that contains a transport name plus possible parameters/options.
     #[query(".listen")]
-    // TODO: consider finding a way to make this `Vec<String>` instead of `Option<Vec<String>>`
-    pub listen: Option<Vec<String>>,
+    #[serde(default)]
+    pub listen: Vec<String>,
 
     /// The bus daemon will write its pid to the specified file.
     #[query(".pidfile")]
@@ -240,11 +240,11 @@ mod tests {
         assert_eq!(
             busconfig,
             BusConfig {
-                listen: Some(vec![
+                listen: vec![
                     String::from("unix:path=/tmp/foo"),
                     String::from("tcp:host=localhost,port=1234"),
                     String::from("tcp:host=localhost,port=0,family=ipv4"),
-                ]),
+                ],
                 ..Default::default()
             }
         );