[data] convert filter() to list in read_cloud_json to fix broken empty-check (#10260)

Signed-off-by: JiangNan <1394485448@qq.com>

README.md

@@ -473,7 +473,7 @@ huggingface-cli login
 
 | Mandatory    | Minimum | Recommend |
 | ------------ | ------- | --------- |
-| python       | 3.9     | 3.10      |
+| python       | 3.11     | >=3.11   |
 | torch        | 2.0.0   | 2.6.0     |
 | torchvision  | 0.15.0  | 0.21.0    |
 | transformers | 4.49.0  | 4.50.0    |

README_zh.md

@@ -475,7 +475,7 @@ huggingface-cli login
 
 | 必需项        | 至少     | 推荐      |
 | ------------ | ------- | --------- |
-| python       | 3.9     | 3.10      |
+| python       | 3.11     | >=3.11   |
 | torch        | 2.0.0   | 2.6.0     |
 | torchvision  | 0.15.0  | 0.21.0    |
 | transformers | 4.49.0  | 4.50.0    |

src/llamafactory/data/data_utils.py

@@ -196,7 +196,7 @@ def read_cloud_json(cloud_path: str) -> list[Any]:
 
     # filter out non-JSON files
     files = [x["Key"] for x in fs.listdir(cloud_path)] if fs.isdir(cloud_path) else [cloud_path]
-    files = filter(lambda file: file.endswith(".json") or file.endswith(".jsonl"), files)
+    files = list(filter(lambda file: file.endswith(".json") or file.endswith(".jsonl"), files))
     if not files:
         raise ValueError(f"No JSON/JSONL files found in the specified path: {cloud_path}.")