fix: Avoid exception when output is missing for exports

mastodon_blocklist_deploy/cli.py

@@ -97,6 +97,9 @@ def cli():
         diffs = Instance.list_diffs(local_blocklist, remote_blocklist)
         Instance.apply_blocks_from_diff(diffs, args.server, args.token, args.no_delete)
     elif args.action == "export":
+        if not args.output:
+            print("Export currently requires to pass --output as well")
+        else:
             export_blocklist_toml(remote_blocklist, args.output)