Cancelling of Attributes Definition Generator Causes Unhandled Promise Rejection Exception

[sholsinger]

By using ctrl+c and cancelling out of the prompt, the user receives the following exception:

✖ Directory containing system-objecttype-extensions.xml? … ./sites/site_template/meta/
(node:38991) UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type undefined
    at validateString (internal/validators.js:125:11)
    at Object.join (path.js:1147:7)
    at /Users/john.smith/.nvm/versions/node/v10.22.0/lib/node_modules/sfcc-dts/dist/updateattrs.js:40:37
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:38991) 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:38991) [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.