Code changed in jenkins
User: Andrew Bayer
[FIXED JENKINS-39011] Error out at parse time when pipeline step is nested.
We don't want to support nesting the pipeline step within other blocks
JENKINS-38152, we never noticed that this was actually
possible, since the parse-time validation just ignored any Jenkinsfile
without a root-level pipeline step, but with
JENKINS-38152, we not
only do another parse round but need to grab the stages from the model
to attach to the run, so we hit an NPE when there's a pipeline step
nested under other blocks.
So - this will now catch when the pipeline step is nested within
another block and give an error message at parse-time, rather than
NPEing at runtime. There is a valid use case for wanting to wrap the
entire build in something like a timeout or timestamper, but we're
going to address that with