Fix x-user-id is null that causes not working http.send

Yan Sushchynski [EPAM/GC]requested to merge
gc_fix_null_header_http_send into master

It seems that http.send cannot accept a null header; and it returns an empty response if it tries to evaluate the entitlements.groups or legal.groups rules.

Edited by Yan Sushchynski [EPAM/GC]

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