fix: application None check when failed get the application name (#220)

* fix: application None check when failed get the application name

* Update src/client/hypr_client.rs

Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

src/client/hypr_client.rs

@@ -19,7 +19,9 @@ impl Client for HyprlandClient {
             let s = serde_json::to_string(&win).ok()?;
             let v: Value = serde_json::from_str(&s).ok()?;
             let app = v["class"].as_str();
-            return Some(String::from(app.unwrap()));
+            if let Some(app) = app {
+                return Some(String::from(app));
+            }
         }
         None
     }