Modifying the pathSrc option causes build to fail

[protoEvangelion]

Hey @Robert-Frampton,

When trying to modify the pathSrc option in electric.config.js it causes electric run to fail.

For instance, I am changing the src folder to docs and then in the electric config I am doing:

module.exports = {
    pathSrc: 'docs'
}

It is failing here: /electric-cli/node_modules/electric/lib/util.js:45:14

Running console.log(siteData.index.children) in that file outputs this:

{ '': { '': { '': [Object] } } }

Therefore the page variable is undefined.

Any ideas? Thanks for the great work!