studio: Don't fail on empty params.

dvc/repo/experiments/utils.py

@@ -340,6 +340,6 @@ def to_studio_params(dvc_params):
         return result
     for rev_data in dvc_params.values():
         for file_name, file_data in rev_data.get("data", {}).items():
-            result[file_name] = file_data["data"]
+            result[file_name] = file_data.get("data", {})
 
     return result

tests/unit/repo/experiments/test_utils.py

@@ -62,6 +62,10 @@ def test_run_check_ref_format(scm, name, result):
             {"workspace": {"data": {"params.yaml": {"data": {"foo": 1}}}}},
             {"params.yaml": {"foo": 1}},
         ),
+        (
+            {"workspace": {"data": {"params.yaml": {"error": "FileNotFound"}}}},
+            {"params.yaml": {}},
+        ),
         (
             {"workspace": {"error": "something went wrong"}},
             {},