importlib.metadata fails to find distributions in empty path

[jaraco]

BPO	45765
Nosy	@jaraco, @miss-islington
PRs	[bpo-45765] Fix distribution discovery on empty path. #29487 [3.10] [bpo-45765] Fix distribution discovery on empty path. (GH-29487) #29510 [3.9] [bpo-45765] Fix distribution discovery on empty path. (GH-29487). #29511

^{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 = 'https://github.com/jaraco'
closed_at = <Date 2021-11-13.23:15:41.964>
created_at = <Date 2021-11-09.13:54:51.659>
labels = []
title = 'importlib.metadata fails to find distributions in empty path'
updated_at = <Date 2021-11-13.23:15:41.963>
user = 'https://github.com/jaraco'

bugs.python.org fields:

activity = <Date 2021-11-13.23:15:41.963>
actor = 'jaraco'
assignee = 'jaraco'
closed = True
closed_date = <Date 2021-11-13.23:15:41.964>
closer = 'jaraco'
components = []
creation = <Date 2021-11-09.13:54:51.659>
creator = 'jaraco'
dependencies = []
files = []
hgrepos = []
issue_num = 45765
keywords = ['patch']
message_count = 4.0
messages = ['406022', '406065', '406293', '406294']
nosy_count = 2.0
nosy_names = ['jaraco', 'miss-islington']
pr_nums = ['29487', '29510', '29511']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue45765'
versions = []

[jaraco]

Reported in python/importlib_metadata#353, importlib.metadata fails to find distributions in the path "". A fix was applied to importlib_metadata 2.1.2 and 4.8.2. Let's apply that fix and backport it to supported Pythons.

[jaraco]

New changeset 6ec0dec by Jason R. Coombs in branch 'main':
[bpo-45765] Fix distribution discovery on empty path. (bpo-29487)
6ec0dec

[jaraco]

New changeset 3e0b830 by Jason R. Coombs in branch '3.9':
[3.9] [bpo-45765] Fix distribution discovery on empty path. (GH-29487). (GH-29511)
3e0b830

[jaraco]

New changeset ed55426 by Miss Islington (bot) in branch '3.10':
[bpo-45765] Fix distribution discovery on empty path. (GH-29487) (GH-29510)
ed55426