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fix I/O operation on closed file error with CliRunner and echo via pager

fix I/O operation on closed file error with CliRunner and echo via pager: a task in repo2rlenv-pr-diff (Harbor dataset). Title: fix I/O operation on closed file error with CliRunner and echo via pager

The task

**Title:** fix I/O operation on closed file error with CliRunner and echo_via_pager

Part of FineEnvs/repo2rlenv-pr-diff.