Move preventDefault/stopPropagation after valid parentPath check

Agent-Logs-Url: https://github.com/MarkEdit-app/MarkEdit-preview/sessions/fd3c45a9-39c8-4dcd-995d-78325ff7b444

Co-authored-by: cyanzhong <6745066+cyanzhong@users.noreply.github.com>

Author: Copilot

src/view.ts

@@ -85,14 +85,14 @@ export function setUp() {
       return;
     }
 
-    event.preventDefault();
-    event.stopPropagation();
-
     const basePath = (await MarkEdit.getFileInfo())?.parentPath;
     if (basePath === undefined) {
       return;
     }
 
+    event.preventDefault();
+    event.stopPropagation();
+
     const absolutePath = joinPaths(basePath, href);
     await MarkEdit.openFile(absolutePath);
   });