[tex-live] Error when running `tlmgr path remove` if docs are not installed

[Yihui Xie]

Hi,

If I install TeX Live without docs (e.g., set option_doc 0 in a profile
file for automated installation), `tlmgr path add` is fine, but I'll run
into an error like this when I run `tlmgr path remove`:

  sh: line 0: cd: $TEXDIR/texmf-dist/doc/man: No such file or directory

I wonder if we could get rid of this error message by checking if the dir
exists before cd.

Regards,
Yihui
--
https://yihui.name
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