Fix examples, and evaluation on Chrome, handle corner cases; Initialize arm support

desktop_env/evaluators/metrics/general.py

@@ -231,8 +231,11 @@ def check_direct_json_object(result, rules)->float:
     print(result)
     print("expected: ")
     print(rules["expected"])
+    if result is None:
+        return 0.
     expected_json = rules["expected"]
     for key in expected_json.keys():
-        if expected_json[key] != result[key]:
+        expected_value = expected_json.get(key)
+        if expected_value != result.get(key):
             return 0.
     return 1.0