jenkinsci/exclusion-plugin — pull request #1 by imod (2011-12-31 16:35:32+00:00)
Title: [JENKINS-12250] Critical block can not be added into conditional step

This pull request extends the build descriptors from BuildStepDescriptor to follow guidelines for Builders.
If the Descriptors extend from the BuildStepDescriptor, the conditional-buildstep plugin will also be able to handle the critical blocks, therefore this change fixes JENKINS-12250.