header_authenticated.lp: add the hostname li only if it's greater t…

[XhmikosR]

…han zero

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[XhmikosR]

BTW if hostname can be empty I guess we should guard the addition in settings-system too.

EDIT: it's already guarded but the check is different. What's the correct one? Can this be an empty string or not?

[yubiuser]

It should not, but users do crazy things ... #3401

[XhmikosR]

OK then, I guess we better leave this as is then.