git-send-email: fix missing space in error message
When the command cannot make a connection to the SMTP server the error message to diagnose the broken configuration is issued. However, when an optional smtp-server-port is given and needs to be reported, the message lacked a space between "hello=<smtp-domain>" and "port=<smtp-server-port>". Signed-off-by: NSylvain Rabot <sylvain@abstraction.fr> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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