poetry install --no-dev shouldn't throw a ValueError if a dev dependency specified via path is missing

[clintmod]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macos Mojave 10.14.5
• Poetry version: 1.0.2
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/clintmod/68aee15a8149f2657e670028927bf896

Issue

When running poetry install --no-dev poetry throws a ValueError with a directory not found message if the directory specified in the dev-dependencies section is missing.

I would expect it to ignore all dev-dependencies when running with --no-dev and not throw a ValueError.

We're using the dev-dependencies section to do local development on modules and checking these in with the pyproject.toml. When we deploy the app with --no-dev we're seeing the error because those directories do not exist.

Our current workaround is to strip the package references with directories out of the dev-dependencies section in the pyproject.toml file when deploying the app.

[finswimmer]

Hello @clintmod ,

thanks a lot reporting. However, this was reported earlier in #668

fin swimmer

[github-actions]

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