"lib.styl" is created when stylus is not chosen

[eliranmal]

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description

i see that a redundant file is created in the when choosing not to use stylus, under src/styles/lib.styl (it's created empty).

steps to reproduce

this was my case, but it may reproduce in a more common scenario, e.g. create the template outside the repo directory.

1. navigate to an existing github project directory

2. run the vue-cli template init command inside that directory

3. answer with the following:

   ? Generate project in current directory? Yes
   ? Project name <name>
   ? Project description <description>
   ? Author <author>
   ? Vue build runtime
   ? Install vue-router? No
   ? Use ESLint to lint your code? Yes
   ? Pick an ESLint preset Airbnb
   ? Install Buefy, a lightweight Vue UI framework with Bulma, useful for your demo/docs pages (will also add a material design icons cdn link to your index.html)? Yes
   ? Install Sass/SCSS (Note: Buefy needs this)? Yes
   ? Install Stylus (Note: You'll need to additionally install it globally for Sublime yourself)? No
   ? Install Pug (formally Jade) for cleaner templates in your .vue files? No
   ? Setup unit tests with Karma + Mocha? Yes
   ? Setup e2e tests with Nightwatch? No
   

environment details

os: mac os 10.12.6 (sierra) node.js: 9.2.0 npm: 5.5.1 vue-cli: 2.9.3