fix: 关联文件打开会出现两个tap

src/main/java/org/jcnc/jnotepad/LunchApp.java

@@ -56,7 +56,9 @@ public class LunchApp extends Application {
             List<String> rawParameters = getParameters().getRaw();
             threadPool.execute(() -> {
                 TextArea textArea = controller.openAssociatedFileAndCreateTextArea(rawParameters);
+                if (!Objects.isNull(textArea)) {
                     Platform.runLater(() -> updateUIWithNewTextArea(textArea));
+                }
             });
         }
     }

src/main/java/org/jcnc/jnotepad/controller/manager/Controller.java

@@ -35,13 +35,13 @@ public class Controller implements ControllerInterface {
         if (!rawParameters.isEmpty()) {
             String filePath = rawParameters.get(0);
             openAssociatedFile(filePath);
-        }
-
+            return null;
+        } else {
             TextArea textArea = createNewTextArea();
             configureTextArea(textArea);
-
             return textArea;
         }
+    }
 
     /**
      * 获取行分隔事件处理程序。