Problem:
When the clover.xml file is invalid xml, the clover post-build action fails and stops the remaining post-build actions from executing.

Suggested solution:
Fail the build when the clover.xml file is invalid but leave the remaining post-build actions execute.

Example clover.xml file that causes the error:
<?xml version="1.0" encoding="utf-8"?>
<coverage clover="0.3.2" generated="1259344237">
<project timestamp="1259344237" name="NoseXUnit"

Error that occurs in the build log:
Publishing Clover coverage report...
Publishing Clover HTML report...
Publishing Clover XML report...
Publishing Clover coverage results...
FATAL: Unable to copy coverage from /var/lib/hudson/jobs/python-logconfig/workspace/reports/cover to /var/lib/hudson/jobs/python-logconfig/builds/2009-11-27_12-50-33
hudson.util.IOException2: Cannot parse coverage results
at hudson.plugins.clover.CloverCoverageParser.parse(CloverCoverageParser.java:89)
at hudson.plugins.clover.CloverCoverageParser.parse(CloverCoverageParser.java:51)
at hudson.plugins.clover.CloverPublisher.processCloverXml(CloverPublisher.java:191)
at hudson.plugins.clover.CloverPublisher.perform(CloverPublisher.java:152)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:541)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:527)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:515)
at hudson.model.Build$RunnerImpl.post2(Build.java:152)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:499)
at hudson.model.Run.run(Run.java:1199)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:123)
Caused by: org.xml.sax.SAXParseException: XML document structures must start and end within the same entity.
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1231)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.apache.commons.digester.Digester.parse(Digester.java:1666)
at hudson.plugins.clover.CloverCoverageParser.parse(CloverCoverageParser.java:87)
... 13 more
FATAL: null
java.lang.NullPointerException
at hudson.plugins.clover.CloverBuildAction.<init>(CloverBuildAction.java:133)
at hudson.plugins.clover.CloverBuildAction.load(CloverBuildAction.java:265)
at hudson.plugins.clover.CloverPublisher.processCloverXml(CloverPublisher.java:197)
at hudson.plugins.clover.CloverPublisher.perform(CloverPublisher.java:152)
at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:541)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:527)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildStep(AbstractBuild.java:515)
at hudson.model.Build$RunnerImpl.post2(Build.java:152)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:499)
at hudson.model.Run.run(Run.java:1199)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:123)