Duo MFA with Exernal AuthN as first flow

[Travis Schmidt]

I set a IdP 3.3 server today to try out the MFA with Duo specifically.
When using the Shibcas plugin for the first flow, the Duo flow would error
with a null pointer exception in DuoWeb.  I thought maybe the username was
causing the problem so I set it up to use Password as the first flow and
then Duo authn worked as expected.  Could there be a problem using External
AuthN as the first flow, or does Shibcas plugin need to be updated to be
compatible with changes in IdP 3.3?

Thanks
Travis
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