Migrator does not populate the ActionTemplateParameter.Id property if it does not exist

[hnrkndrssn]

This causes issues when trying to save a step template that was created prior to the Id property was added and then imported using the migrator.

Source: https://secure.helpscout.net/conversation/328116236?folderId=571729

[octoreleasebot]

Release Note: Migrator now updates step template parameter IDs if they are null when imported

[lock]

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