Issue #3607955: Fix TypeError in administerusersbyrole_form_user_form_submit() when roles #options is null

Tuomas Välimaarequested to merge
issue/administerusersbyrole-3607955:3607955-fatal-typeerror-in into 8.x-3.x

Issue #3607955: Fix TypeError in administerusersbyrole_form_user_form_submit() when roles #options is null

Closes #3607955

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