Octavia replace "limit" with None when it is less 1. (for example 0, -1)
However the further code failed to compare None and int values.
This patch fixes it by validation, that limit is None.
Co-Authored-By: Roman Goncharov <gadzhet007@gmail.com>
Closes-Bug: #2060917
Change-Id: I9bb45a1aca6b7b18644752a3dccc3ebfb7c106ef