Checking for rhinoscript BooleanUnion failure returning an all-zero GUID

@S_L wrote:

I have a python script that calls rs.BooleanUnion. In some cases the union appears to fail but it returns an all-zero GUID 00000000-0000-0000-0000-000000000000 instead of None.
How can I check if the System.Guid object is an all-zero GUID so I can handle the error in my code? The resulting variable type is System.Guid so i can’t do the usual handling like so:

if not boolean_result: dosomething

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