[Form] Removed "magic" from FormErrorIterator
feature #10418 [Form] Removed "magic" from FormErrorIterator (webmozart)

This PR was merged into the 2.5-dev branch.

Discussion
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[Form] Removed "magic" from FormErrorIterator

| 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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daac66e [Form] Removed "magic" from FormErrorIterator