Prevent badly-formatted dependencies from erroring `poetry init`

[AngelOnFira]

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Feature Request

Hi 👋

So while running poetry init, I got partway through to the interactive dependency section. Then I tried to add a package django debug toolbar. This threw a ValueError since it wasn't the proper format. Completely fair.

However, this ValueError crashed the poetry init, and so I had to restart, and put all my info in again. Would be more helpful to print an error, and allow me to type in another dependency.

[github-actions]

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