'Matches' function returns error when used how it's documented

[Nate Potter]

In cinder.api.openstack.api_version_request the function 'matches' calls the method .is_null() on the min_version and max_version parameters. In the documentation here http://docs.openstack.org/developer/cinder/devref/api_microversion_dev.html#when-do-i-need-a-new-microversion, it shows that these parameters are intended to be string values. However, this results in an error when the code actually runs because there is no is_null() method for strings, or even floats which the version numbers could also be interpreted as.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/291448

[Scott DAngelo (scott-dangelo)]

Nate this is a duplicate of:
https://bugs.launchpad.net/cinder/+bug/1550337

The fix has been proposed:
https://review.openstack.org/#/c/285293/

[OpenStack Infra (hudson-openstack)]

Change abandoned by Nate Potter (<email address hidden>) on branch: master
Review: https://review.openstack.org/291448