Allow unfunctioing pydoc to fail

[d125q]

Otherwise, one cannot activate a virtualenv under Zsh with set -e.

As an example,

$ zsh -c 'set -ex; source /path/to/virtualenv/bin/activate; echo activated'
+zsh:1> source /path/to/virtualenvbin/activate
+/path/to/virtualenvbin/activate:5> [ '' '=' /path/to/virtualenvbin/activate ']'
+/path/to/virtualenvbin/activate:47> deactivate nondestructive
+deactivate:1> unset -f pydoc

fails with exit code 1 because there is nothing to unset. (The relevant version are: zsh 5.8.0.2-dev (x86_64-pc-linux-gnu), Python 3.9.1, and virtualenv 20.3.0.)

[codecov]

Codecov Report

Merging #2049 (1e1b76d) into main (a4025d6) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2049      +/-   ##
==========================================
- Coverage   94.04%   94.01%   -0.03%     
==========================================
  Files          87       87              
  Lines        4331     4331              
==========================================
- Hits         4073     4072       -1     
- Misses        258      259       +1     

Flag	Coverage Δ
tests	94.01% <ø> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/virtualenv/seed/embed/base_embed.py	96.22% <0.00%> (-1.89%)	⬇️

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[gaborbernat]

Please add a changelog entry, thanks!

[d125q]

Please add a changelog entry, thanks!

Added; thanks likewise!

[gaborbernat]

[gaborbernat]

Released now via https://virtualenv.pypa.io/en/latest/changelog.html#v20-3-1-2021-01-13