fix(loaders/utilsprocessComponent): wrong error when trying to doc a js file
fix(loaders/utilsprocessComponent): wrong error when trying to doc a js file

Error "message is not defined" is thrown when the styleguide.config.js
includes a "component" that is not a .vue file.

It's supposed to throw `Error when parsing ${filepath}:\n\n` + 'Only can
parse files .vue:\n'

vue-styleguidist/vue-styleguidist,vue-styleguidist/vue-styleguidist,vue-styleguidist/vue-styleguidist,vue-styleguidist/vue-styleguidist