External auth lookup_by_identity should handle missing request parameter #16386
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https://bugzilla.redhat.com/show_bug.cgi?id=1505922
Method Httpd#lookup_by_identity has been updated to take an optional parameter but
was not properly handling if the parameter was not provided.
This PR ensures Httpd#lookup_by_identity does the correct thing when the optional request parameter is and is not provided.
Steps for Testing/QA [Optional]
Setup MiQ for External Auth
Log into classic UI, with valid user.
Ensure the error pop-up: "400 /auth/api error message" (see screenshot in BZ) does not appear
and there are not tracebacks in the api.log