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Description
Describe the bug
AadSmartOnFhirProxyController.cs logs a caught null redirect URL as a NullRef exception
To Reproduce
If an empty redirect URL is passed to the AadSmartOnFhirProxyController.cs, the exception is caught appropriately, but still logged as a NullRef exception which appears in our exception list. This should be downgraded to informational or debug level.
Expected behavior
A less severe log should be created, such as debug or information level.