cast machine name (which could be None) to string
cast machine name (which could be None) to string

xflash96/gitolite-sshkey-form,yongjhih/gitlolite-sshkey,yongjhih/gitlolite-sshkey,xflash96/gitolite-sshkey-form,xflash96/gitolite-sshkey-form,yongjhih/gitlolite-sshkey,xflash96/gitolite-sshkey-form