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flag: prevent BoolWithInverseFlag.String from panicking without a tab

flag: prevent BoolWithInverseFlag.String from panicking without a tab: a task in repo2rlenv-pr-diff (Harbor dataset). Title: flag: prevent BoolWithInverseFlag.String from panicking without a tab

The task

**Title:** flag: prevent BoolWithInverseFlag.String from panicking without a tab

Part of FineEnvs/repo2rlenv-pr-diff.