fix(LAB-3992): fix to ensure the json_metadatas is correct

Author: Sihem Tchabi

src/kili/services/asset_import/base.py

@@ -165,7 +165,12 @@ def stringify_metadata(asset: AssetLike) -> AssetLike:
         """Stringify the metadata."""
         json_metadata = asset.get("json_metadata", {})
         if not isinstance(json_metadata, str):
-            json_metadata = dumps(json_metadata)
+            try:
+                json_metadata = dumps(json_metadata, allow_nan=False)
+            except (ValueError, TypeError) as e:
+                raise ValueError(
+                    f"Invalid json_metadata: cannot be serialized to valid JSON ({e})"
+                ) from e
         return {**asset, "json_metadata": json_metadata}
 
     @staticmethod