worker: ignore '' username
Some PAM modules set a "" username to mean "user not set yet", apparently, instead of NULL. This commit guards against that to prevent a crash. Red-Hat-Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=965370 https://bugzilla.gnome.org/show_bug.cgi?id=721803
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60c531fc
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