blank AzureMigrationID


I ran the tool on one of my web servers and saved the report to a file. When I uploaded the file to Migration Assistant website, I was prompted for an Azure Migration ID. No matter what I entered in the field I always got "An error occurred while processing your request".
Then I looked at the file that was generated when I saved the report. This section seemed suspicious:
I copied the GUID from the filename and pasted it into the empty quotes, re-uploaded the file, and this time everything worked correctly.

So I'm thinking the empty AzureMigrationID value is a bug?