Gem::Version.new(nil) raises ArgumentError: Malformed version number string
Gem::Version.new(nil) raises ArgumentError: Malformed version number string

In tests we weren't setting the version number for our mock api and this
error was noticed when upgrading from Gem v2.7.6 to v2.7.7.

ansible/ansible_tower_client_ruby,ManageIQ/ansible_tower_client,ManageIQ/ansible_tower_client,ansible/ansible_tower_client_ruby