Add execute timeout to server; Fix error examples

desktop_env/evaluators/metrics/vscode.py

@@ -236,6 +236,9 @@ def check_html_background_image(src_path: str, rule: Dict = None) -> float:
     Check if the background image is correctly set.
     multi-app:bb7db4c2-30b5-4be7-8dd7-b8c4ec7d3108
     """
+    if not src_path:
+        return 0.0
+
     from bs4 import BeautifulSoup
     with open(src_path, 'r') as f:
         html_content = f.read()
@@ -252,6 +255,9 @@ def compare_result_files(src_path, tgt_path):
     Compare whether the content of two files are the same.
     multi-app:7f35355e-02a6-45b5-b140-f0be698bcf85
     """
+    if not src_path or not tgt_path:
+        return 0.0
+
     with open(src_path, 'r') as f:
         src_content = f.read().strip()
     with open(tgt_path, 'r') as f:

desktop_env/server/main.py

@@ -63,7 +63,7 @@ def execute_command():
 
     # Execute the command without any safety checks.
     try:
-        result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=shell, text=True)
+        result = subprocess.run(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=shell, text=True, timeout=120)
         return jsonify({
             'status': 'success',
             'output': result.stdout,