opt: more debug info

src/flutter.rs

@@ -549,9 +549,11 @@ pub mod connection_manager {
             let mut h: HashMap<&str, &str> = event.iter().cloned().collect();
             assert!(h.get("name").is_none());
             h.insert("name", name);
-
+        
             if let Some(s) = GLOBAL_EVENT_STREAM.read().unwrap().get(super::APP_TYPE_CM) {
                 s.add(serde_json::ser::to_string(&h).unwrap_or("".to_owned()));
+            } else {
+                println!("Push event {} failed. No {} event stream found.", name, super::APP_TYPE_CM);
             };
         }
     }