Catch a wider range of errors when iterating FlowExecutionList

[jglick]

Saw a user boot failure involving an apparently proprietary plugin of the form

java.lang.NoClassDefFoundError: Could not initialize class …
	at ….onNewHead(…)
	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.notifyListeners(CpsFlowExecution.java:1440)
	at org.jenkinsci.plugins.workflow.cps.FlowHead.setNewHead(FlowHead.java:153)
	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.createPlaceholderNodes(CpsFlowExecution.java:661)
	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.onLoad(CpsFlowExecution.java:718)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun.getExecution(WorkflowRun.java:664)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun.onLoad(WorkflowRun.java:526)
	at hudson.model.RunMap.retrieve(RunMap.java:225)
	at hudson.model.RunMap.retrieve(RunMap.java:57)
	at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:501)
	at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:483)
	at jenkins.model.lazy.AbstractLazyLoadRunMap.getByNumber(AbstractLazyLoadRunMap.java:381)
	at hudson.model.RunMap.getById(RunMap.java:205)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun$Owner.run(WorkflowRun.java:901)
	at org.jenkinsci.plugins.workflow.job.WorkflowRun$Owner.get(WorkflowRun.java:912)
	at org.jenkinsci.plugins.workflow.flow.FlowExecutionList$1.computeNext(FlowExecutionList.java:65)
	at org.jenkinsci.plugins.workflow.flow.FlowExecutionList$1.computeNext(FlowExecutionList.java:57)
	at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
	at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
	at org.jenkinsci.plugins.workflow.flow.FlowExecutionList$ItemListenerImpl.onLoaded(FlowExecutionList.java:178)
	at jenkins.model.Jenkins.<init>(Jenkins.java:989)
	at hudson.model.Hudson.<init>(Hudson.java:85)
	at hudson.model.Hudson.<init>(Hudson.java:81)
	at hudson.WebAppMain$3.run(WebAppMain.java:233)
Caused: hudson.util.HudsonFailedToLoad
	at hudson.WebAppMain$3.run(WebAppMain.java:247)

(internal ref: ZD-75792)

[dwnusbaum]

hudson.model.Computer$TerminationRequest: Termination requested at Tue Jun 04 12:50:23 UTC 2019 by Thread[Ping thread for channel hudson.remoting.Channel@73637cba:JNLP4-connect connection from 40.70.23.213/40.70.23.213:49188,5,main] [id=64856]