mod_http_upload: Fix issuing slots to components or other non-c2s sessions The 'full_jid' property only exists on local c2s sessions. This was not adjusted for in 0a56dc6c61af, so it did not work. Thanks Fren__ for highlighting the issue.

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summary: Allow server administrators to probe any user
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This module lets server administrators send `<presence type="probe"/>`
to any local user and receive their presence in response, bypassing
roster checks.