Fixes message value for objects
bug #9865 [Validator] Fixes message value for objects (jongotlin)

This PR was submitted for the 2.2 branch but it was merged into the 2.3 branch instead (closes #9865).

Discussion
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[Validator] Fixes message value for objects

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Commits
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7b69e9b [Validator] Fixes message value for objects