bundle: fix bundle generation for empty changegroup
[hooks]pretxncommit.cr = python:hgext.win32text.forbidcrpretxnchangegroup.cr = python:hgext.win32text.forbidcrAttempt to commit or push text file(s) using CR line endingsin dea860dc51ec: ftransaction abort!rollback completedabort: pretxncommit.cr hook failedhello<LF>hello<CR>