Script Download:FixEmptyDisplayName.zip
http://gallery.technet.microsoft.com/scriptcenter/Fix-Empty-DisplayName-1516deef

This script is used to fix empty displayname attribute for on-premises mail-enabled groups

This script verifies displayName attribute for mail-enabled groups. This script enables you to export mail-enabled groups that have empty display name. After correcting the display name of these groups, you can use this script to import them to your on-premises Active Directory.

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You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery