added getter to transformer chain
feature #9837 [Form] added getter to transformer chain (cordoval)

This PR was merged into the 2.5-dev branch.

Discussion
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[Form] added getter to transformer chain

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9503
| License       | MIT
| Doc PR        | na

Commits
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3565d96 added getter to transformer chain