fix multiple base-studies

store/neurostore/ingest/__init__.py

@@ -494,7 +494,7 @@ def get_base_study(metadata_row):
         if len(base_studies) == 1:
             return base_studies[0]
         elif len(base_studies) > 1:
-            return merge_base_studies(base_studies)
+            return merge_base_studies(base_studies, doi, pmid)
         else:
             created_bs = [
                 bs for bs in all_base_studies if bs.doi == doi and bs.pmid == pmid
@@ -503,11 +503,17 @@ def get_base_study(metadata_row):
                 return created_bs[0]
             return BaseStudy.query.filter_by(pmid=pmid).one_or_none()
 
-    def merge_base_studies(base_studies):
-        source_base_study = next(
-            filter(lambda bs: bs.pmid == pmid and bs.doi == doi, base_studies),
-            base_studies[0],
-        )
+    def merge_base_studies(base_studies, doi, pmid):
+        if doi is None:
+            source_base_study = next(
+                filter(lambda bs: bs.pmid == pmid and bs.doi is not None, base_studies),
+                base_studies[0],
+            )
+        else:
+            source_base_study = next(
+                filter(lambda bs: bs.pmid == pmid and bs.doi == doi, base_studies),
+                base_studies[0],
+            )
         other_base_studies = [
             bs for bs in base_studies if bs.id != source_base_study.id
         ]