Handle Shopify URL protocols in slater.config.js

[bomanimc]

Hi! I'm new to Slater, and I noticed that I stumbled for a while trying to understand why my uses of npm run deploy:development and slater watch ere failing given my credentials with the error:

slater v1.8.0

watch development theme

built in 2.734s
  > index.css
  > index.js
(node:15238) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'asset' of undefined
    at theme.sync.then.then.catch (/usr/local/lib/node_modules/slater/index.js:156:57)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:15238) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:15238) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
(node:15238) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'asset' of undefined
    at theme.sync.then.then.catch (/usr/local/lib/node_modules/slater/index.js:156:57)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:15238) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)

I eventually noticed that the issue was that I listed my Shopify URL in slater.config.js as https://dial-up-digital-development.myshopify.com instead of dial-up-digital-development.myshopify.com.

I think it would be ideal from a developer experience for syncing to not fail if the protocol is added in the URL. It also seems that Theme Kit handles protocols in Shopify URLs.