metadata fails when referenced chunks don't have CSS dependencies

[tivac]

Expected Behavior

Writing out metadata should succeed, even if some of the chunks don't have any CSS dependencies.

Current Behavior

TypeError: Cannot read property 'dest' of undefined

Possible Solution

Filter the list of dependencies in rollup.js inside the if(options.meta) block so that only those that exist in out are used to create the array.

Steps to Reproduce (for bugs)

1. Set meta : true in the rollup plugin
2. Build a project that has chunks w/o CSS dependencies
3. 🔥 💀

Context

Want to use metadata to rewrite chunks after a build to include their CSS automatically, but can't do that atm because the build fails.

Your Environment

Executable	Version
modular-css	v21.0.0
npm --version	v6.5.0
node --version	v10.12.0

OS	Version
Windows 10	1607