"IllegalArgumentException: Collection is empty" when processing emtpy Cobertura results

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      My build for some reasons produces an empty Cobertura report, like this:

      <?xml version="1.0" ?>
<!DOCTYPE coverage
  SYSTEM 'http://cobertura.sourceforge.net/xml/coverage-03.dtd'>
<coverage>
	<sources>
		<source>
			/private/var/lib/hudson/workspace/myproj/client
		</source>
	</sources>
	<packages/>
</coverage>

      Whenever I load the project page or the Cobertura report page, I get an exception in the server log:

      2010-maj-03 13:44:49 hudson.ExpressionFactory2$JexlExpression evaluate
VARNING: Caught exception evaluating: it.metrics. Reason: java.lang.reflect.InvocationTargetException
java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor548.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.commons.jexl.util.PropertyExecutor.execute(PropertyExecutor.java:125)
        at org.apache.commons.jexl.util.introspection.UberspectImpl$VelGetterImpl.invoke(UberspectImpl.java:314)
        at org.apache.commons.jexl.parser.ASTArrayAccess.evaluateExpr(ASTArrayAccess.java:185)
        at org.apache.commons.jexl.parser.ASTIdentifier.execute(ASTIdentifier.java:75)
        at org.apache.commons.jexl.parser.ASTReference.execute(ASTReference.java:83)
        at org.apache.commons.jexl.parser.ASTReference.value(ASTReference.java:57)
        at org.apache.commons.jexl.parser.ASTReferenceExpression.value(ASTReferenceExpression.java:51)
        at org.apache.commons.jexl.ExpressionImpl.evaluate(ExpressionImpl.java:80)
        at hudson.ExpressionFactory2$JexlExpression.evaluate(ExpressionFactory2.java:72)
        at org.apache.commons.jelly.tags.core.CoreTagLibrary$3.run(CoreTagLibrary.java:134)
        at org.apache.commons.jelly.impl.ScriptBlock.run(ScriptBlock.java:95)
        at org.kohsuke.stapler.jelly.CallTagLibScript$1.run(CallTagLibScript.java:75)
        at org.apache.commons.jelly.tags.define.InvokeBodyTag.doTag(InvokeBodyTag.java:91)
        at org.apache.commons.jelly.impl.TagScript.run(TagScript.java:270)
...
Caused by: java.lang.IllegalArgumentException: Collection is empty
        at java.util.EnumSet.copyOf(EnumSet.java:166)
        at hudson.plugins.cobertura.targets.CoverageResult.getMetrics(CoverageResult.java:331)
        ... 92 more

            Assignee:
            Michael Barrientos
            Reporter:
            Marcus Better
            Archiver:
            Jenkins Service Account

              Created:
              Updated:
              Resolved:
              Archived: