return [] if no unused wells

well_status_utils.py

@@ -64,6 +64,11 @@ def find_unused_wells():
     response = list(collection.find(query))  
     df = pd.DataFrame(response)
 
+    # If no entries at all, just return an empty list
+    if df.empty:
+        dbclient.close()
+        return []
+
     # Extract the "well" column as a list
     if "well" not in df.columns:
         raise ValueError("The returned data does not contain the 'well' field.")