Unhandled ModuleNotFoundError when installing without the [poetry] extra

[enpaul]

The package explicitly depends on the poetry-core package which uses some trickery to be importable under the poetry.core namespace. This means that the principle import of import poetry works without the poetry package being installed.

This impacts us because we detect weather Poetry is installed based on whether poetry is importable. However, if poetry is not installed but poetry-core is then import poetry works but import poetry.config (or any other module other than poetry.core) fails with a ModuleNotFoundError. A patch can be made to avoid this problem by adding ModuleNotFoundError to the try/except in tox_poetry_installer._poetry, however this may be worth rethinking as part of #2

[enpaul]

Nevermind, the try/except for the ImportError will catch this since ModuleNotFoundError is a subclass of ImportError