Fix regression of PipelineRequest in retry

[xiangyan99]

No description provided.

[adxsdk6]

Can one of the admins verify this patch?

[bryevdv]

LGTM to me. For my own edification, what other sorts of responses can come through (or is this just a guard against None?)

[kristapratico]

Also LGTM, good catch.

@bryevdv This is due to the increment method accepting either the pipeline response or pipeline request under the same response param.

In the send method...
retry_active = self.increment(retry_settings, response=response)
and
retry_active = self.increment(retry_settings, response=request, error=err)