Package errors out when adding `@codepen` tag to inline block documentation.

[indifferentghost]

How often can you reproduce it?

• Always

Description:
Package errors out when adding @codepen tag to inline block documentation.

ERROR:
   tag - codepen
   line- @codepen
/Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/q/q.js:155
                throw e;
                ^

TypeError: Cannot read property 'codepen' of undefined
    at Object.add (/Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-html-codepen-link/tags.js:11:31)
    at module.exports (/Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-process-tags/process-tags.js:95:29)
    at /Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-js/process/code_and_comment.js:41:4
    at module.exports (/Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-js/process/code.js:42:2)
    at module.exports (/Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-js/process/code_and_comment.js:40:3)
    at /Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-js/process/javascript.js:26:13
    at Array.map (<anonymous>)
    at module.exports (/Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/configure/node_modules/bit-docs-js/process/javascript.js:25:29)
    at /Users/bitovi/Documents/bitovi/canjs/node_modules/bit-docs/lib/process/file.js:80:17
    at Array.some (<anonymous>)

Steps to reproduce:

• Detail the exact steps taken to produce the problem
  Attempted to add @codepen tag to a can-define/list/list example. Running ./node_modules/.bin/bit-docs causes the error above.

• Include a gif if possible; you can use LICEcap to make a gif: http://www.cockos.com/licecap/
  

Expected results:
Successfully ink to codepen and generate documentation properly.

Environment:

Software	Version
bit-docs-html-codepen-link version	1.2.1
Browser
Operating system	Mac 10.13.6

[indifferentghost]

It seems to be referencing this line in bit-docs-html-codepen-link.

Changing that line to what's below prevents the error, but still provides unexpected results:

if(options.siteConfig && options.siteConfig.codepen) {
    this.codepen = options.siteConfig.codepen;
}

unexpected results

[indifferentghost]

After further testing:

if(options.siteConfig && options.siteConfig.codepen) {
    this.codepen = options.siteConfig.codepen;
}

Fixes the issue with proper tabbing.