[Do not merge] return if no standard storage is available

[MSSedusch]

fix for minor issue

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[markcowl]

ahh, the dreaded null ref exception

on demand run here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-demand/548/

[hovsepm]

this PR needs to sync with dev branch. I've created one here #1868