Empty mapping value [#3397329]

Problem/Motivation

The 'mapping' property of config/schema/authorization_group.consumer.yml is empty.

Steps to reproduce

$ $CI_PROJECT_DIR/$_WEB_ROOT/core/node_modules/.bin/eslint --no-error-on-unmatched-pattern --ignore-pattern="*.es6.js" --resolve-plugins-relative-to=$CI_PROJECT_DIR/$_WEB_ROOT/core --ext=.js,.yml . || true
/builds/issue/authorization_group-3391968/web/modules/custom/authorization_group-3391968/config/schema/authorization_group.consumer.yml
  4:3  error  Empty mapping values are forbidden  yml/no-empty-mapping-value
✖ 1 problem (1 error, 0 warnings)

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Issue fork authorization_group-3397329

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3397329-empty-mapping-value changes, plain diff MR !8
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