venv: Don't produce unbound variable warning on deactivate

[danabr]

BPO	37885
Nosy	@Yhg1s, @danabr
PRs	bpo-37885: venv: Don't produce unbound variable warning on deactivate #15330 [3.8] bpo-37885: venv: Don't produce unbound variable warning on deactivate (GH-15330) #15973 [3.7] bpo-37885: venv: Don't produce unbound variable warning on deactivate (GH-15330) #15974

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-09-11.15:57:27.125>
created_at = <Date 2019-08-19.08:50:09.202>
labels = ['type-feature', 'library']
title = "venv: Don't produce unbound variable warning on deactivate"
updated_at = <Date 2019-09-11.15:57:27.124>
user = 'https://github.com/danabr'

bugs.python.org fields:

activity = <Date 2019-09-11.15:57:27.124>
actor = 'twouters'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-11.15:57:27.125>
closer = 'twouters'
components = ['Library (Lib)']
creation = <Date 2019-08-19.08:50:09.202>
creator = 'danabr'
dependencies = []
files = []
hgrepos = []
issue_num = 37885
keywords = ['patch']
message_count = 5.0
messages = ['349944', '351918', '351955', '351957', '351958']
nosy_count = 2.0
nosy_names = ['twouters', 'danabr']
pr_nums = ['15330', '15973', '15974']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37885'
versions = []

[danabr]

Running deactivate from a bash shell configured to treat undefined variables as errors (set -u) produces a warning:

$ python3 -m venv test
$ source test/bin/activate
(test) $ deactivate
-bash: $1: unbound variable

[Yhg1s]

New changeset 5209e58 by T. Wouters (Daniel Abrahamsson) in branch 'master':
bpo-37885: venv: Don't produce unbound variable warning on deactivate (GH-15330)
5209e58

[Yhg1s]

New changeset 63eefc3 by T. Wouters (Miss Islington (bot)) in branch '3.8':
bpo-37885: venv: Don't produce unbound variable warning on deactivate (GH-15973)
63eefc3

[Yhg1s]

New changeset d126fbd by T. Wouters (Miss Islington (bot)) in branch '3.7':
bpo-37885: venv: Don't produce unbound variable warning on deactivate (GH-15974)
d126fbd

[Yhg1s]

Thanks, fix merged.