Import virtual machines or template operation of Microsoft Test Manager throws 'Object reference not set to an instance of an object’'

This post addresses a specific bug in Team Foundation Server 2012 Update 4 with System Center Virtual Machine Manager 2012 R2 where importing VMs or templates with no description in the VMM library share to Team Foundation Server library using Microsoft Test Manager throws an 'Object reference not set to an instance of an object' error. It provides a workaround to add descriptions to all VMs/templates and a PowerShell script to identify VMs/templates lacking descriptions.