Check table names in Xapian; if not, default to "-1".

Without this check, there will always be an error when this script is
run with the "is-data-modified" flag should there be no database in
the XAPIAN_DIRECTORY.

Signed-off-by: Munyoki Kilyungi <me@bonfacemunyoki.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/scripts/index-genenetwork b/scripts/index-genenetwork
index 4d9a5f8..61780e5 100755
--- a/scripts/index-genenetwork
+++ b/scripts/index-genenetwork
@@ -461,12 +461,14 @@ def is_data_modified(xapian_directory: str,
                      sparql_uri: str) -> None:
     dir_ = pathlib.Path(xapian_directory)
     with locked_xapian_writable_database(dir_) as db, database_connection(sql_uri) as conn:
-        checksums = " ".join([
-            str(result["Checksum"].value)
-            for result in query_sql(
-                    conn,
-                    f"CHECKSUM TABLE {', '.join(db.get_metadata('tables').decode().split())}")
-        ])
+        checksums = -1
+        if db.get_metadata('tables'):
+            checksums = " ".join([
+                str(result["Checksum"].value)
+                for result in query_sql(
+                        conn,
+                        f"CHECKSUM TABLE {', '.join(db.get_metadata('tables').decode().split())}")
+            ])
         # Return a zero exit status code when the data has changed;
         # otherwise exit with a 1 exit status code.
         if (db.get_metadata("generif-checksum").decode() == hash_generif_graph(sparql_uri) and