As of version 2.17.0 the verified "vote" is not sent at all to Gerrit (removed from the command line/rest call) unless there is an actual value to be sent. So if you change the configuration to contain only values for code review and empty strings for verified you won't get the error.
Version 2.27.2 (released Jan 15 2018)
- JENKINS-48943 Whitelist gerrit-events and workaround missing collections whitelisting in core for Jenkins 2.102+ (93a7719, pull #343)
- Fix loose forbidden file (pull #339)
Version 2.27.1 (released Dec 06 2017)