Print error instead of panicking on unrecognized IPC even ttoken

apps/magpie/src/service/ipc.rs

@@ -257,7 +257,7 @@ impl Ipc {
                     self.clients.remove(event.token().0);
                 }
             } else {
-                panic!("Unrecognized event token: {:?}", event);
+                eprintln!("Unrecognized event token: {:?}", event);
             }
         }