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improve empty slice/array handling in form binding ( 4380)

improve empty slice/array handling in form binding ( 4380): a task in repo2rlenv-commit-runtime-test: repo2rlenv-commit-runtime (Harbor dataset). Title: improve empty slice/array handling in form binding

The task

**Title:** improve empty slice/array handling in form binding

Part of AdithyaSK/repo2rlenv-commit-runtime-test.