add workaround for devices without a name

Author: bernhardfritz

src/engine.rs

@@ -107,10 +107,10 @@ where
 {
     let mut stream_to_start = None;
 
-    let mixer = {
+    let mixer = if let Ok(device_name) = device.name() {
         let mut end_points = engine.end_points.lock().unwrap();
 
-        match end_points.entry(device.name().expect("No device name")) {
+        match end_points.entry(device_name) {
             Entry::Vacant(e) => {
                 let (mixer, stream) = new_output_stream(engine, device);
                 e.insert(Arc::downgrade(&mixer));
@@ -128,6 +128,10 @@ where
                 }
             },
         }
+    } else {
+        let (mixer, stream) = new_output_stream(engine, device);
+        stream_to_start = Some(stream);
+        mixer
     };
 
     if let Some(stream) = stream_to_start {