Poetry config reports wrong error message when missing values for `poetry config http-basic`

• Poetry version: 1.2.2
• Python version: 3.9.2
• OS version and name:Debian GNU/Linux 11 (bullseye)
• pyproject.toml: Default config after poetry init - see below

[tool.poetry]
name = "test"
version = "0.1.0"
description = ""
authors = ["Leo Kirchner <leo.kirchner@networktocode.com>"]
readme = "README.md"

[tool.poetry.dependencies]
python = "^3.9"


[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

• I am on the latest stable Poetry version, installed using a recommended method.
• I have searched the issues of this repo and believe that this is not a duplicate.
• I have consulted the FAQ and blog for any relevant entries or release notes.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option) and have included the output below.

Issue

I think the error message for missing credentials in this command could be a little more precise:

$ poetry config http-basic.foo

There is no http-basic.foo setting.

This is especially relevant when using environment variables inside a DOCKERFILE where the variables may be (accidentally) undefined:

$ poetry config http-basic.foo $FOO_NAME $FOO_PASSWORD

There is no http-basic.foo setting.

Start at the CLI entry point for poetry config http-basic and reproduce the two commands shown in the issue, including the undefined environment-variable case. Trace how missing values are handled and verify that the resulting message distinguishes missing credentials from an absent setting.