Update dblp-discovery-dataset.py

dblp-discovery-dataset.py

@@ -168,6 +168,6 @@ class D3(datasets.GeneratorBasedBuilder):
                     data = json.loads(row)
                     # For none open access papers, the abstract is not in the dataset
                     # Replace it with an empty string
-                    if "abstract" not in data:
+                    if "abstract" not in data and "papers" in filepaths:
                         data["abstract"] = ""
                     yield id_, data