Checks fail when `authorized ip ranges` does not exist

[fgauna12]

               Scanning Cluster Setup Items               
Checking for authorized ip ranges...
(node:144) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'authorizedIpRanges' of null
    at Module.checkForAuthorizedIpRanges (file:///app/modules/clusterSetup.js:15:6)
    at checkAzure (file:///app/index.js:53:29)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
    at async Command.main (file:///app/index.js:162:3)
(node:144) 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(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:144) [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.