[Form] Disabled violation mapping of unsubmitted forms
bug #10567 [Form] Disabled validation/violation mapping of unsubmitted forms (webmozart)

This PR was merged into the 2.5-dev branch.

Discussion
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[Form] Disabled validation/violation mapping of unsubmitted forms

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9998
| License       | MIT
| Doc PR        | -

This PR fixes submissions of PATCH form in the case that any of the non-submitted forms causes an error (such as not-null).

Commits
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9dfebd5 [Form] Disabled violation mapping of unsubmitted forms