我根据文档配置了Jenkins git pull请求插件:https://wiki.jenkins-ci.org/display/JENKINS/GitHub+pull+request+builder+plugin但是build返回给我
ERROR: Couldn't find any revision to build. Verify the repository and branch configuration for this job.
如果我将"Branch Specifier"留空,Jenkinks会在我的仓库中检查每个PR(甚至关闭).如何强制它只建立开放的公关？