Check for path existence

Issue: https://github.com/genenetwork/gn-gemtext-threads/blob/main/topics/gn1-migration-to-gn2/partial-correlations.gmi

1 files changed, 5 insertions, 2 deletions

diff --git a/gn3/db/correlations.py b/gn3/db/correlations.py
index 5361a1e..d372607 100644
--- a/gn3/db/correlations.py
+++ b/gn3/db/correlations.py
@@ -29,8 +29,11 @@ def get_filename(conn: Any, target_db_name: str, text_files_dir: str) -> Union[
             filename = "ProbeSetFreezeId_{tid}_FullName_{fname}.txt".format(
                 tid=result[0],
                 fname=result[1].replace(' ', '_').replace('/', '_'))
-            return ((filename in os.listdir(text_files_dir))
-                    and f"{text_files_dir}/{filename}")
+            full_filename = f"{text_files_dir}/{filename}"
+            return (
+                os.path.exists(full_filename) and
+                (filename in os.listdir(text_files_dir)) and
+                full_filename)
 
     return False