try to return a NULL::integer

hive/db/sql_scripts/hive_post_operations.sql

@@ -40,7 +40,7 @@ declare
         __community_type_council CONSTANT SMALLINT := 3;
 BEGIN
         IF _block_num < _community_support_start_block THEN
-            RETURN QUERY ( SELECT FALSE, 0);
+            RETURN QUERY ( SELECT FALSE, NULL::integer);
             RETURN; -- extra return because a RETURN QUERY does not end the function
         END IF;