Conform to schema

Authored by bmansurov.
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Conform to schema

  • Don't send username if it is null;
  • Don't send userCount if it is null;

Bug: T85963
Change-Id: Id992ed3e3747a705fd88d30c86913105dcc52604
(cherry picked from commit 3441e923a64738f9f97b624807cb6dd2d5192158)