title: Jenkins CI: 'NumberFormatException: empty String'
body: <p>We have a Jenkins installation and some projects which are tested by NUnit. This works fine and it writes an NUnit results XML file.
  Then we have a 'Publish NUnit test result report' post-build step. But since friday it produces this error:</p>
  
  <pre><code>Recording NUnit tests results
  ERROR: Step ‘Publish NUnit test result report’ aborted due to exception: 
  java.io.IOException: remote file operation failed: C:\Jenkins\workspace\xxx at hudson.remoting.Channel@205d5d5c:CIAgent: java.io.IOException: Failed to read C:\Jenkins\workspace\xxx\temporary-junit-reports\TEST-xxx_Tests.TestsWithRealServers.TestWithTwoLocals_1_2.xml
      at hudson.FilePath.act(FilePath.java:986)
      at hudson.FilePath.act(FilePath.java:968)
      at hudson.plugins.nunit.NUnitPublisher.getTestResult(NUnitPublisher.java:226)
      [...]
  
  Caused by: java.io.IOException: Failed to read C:\Jenkins\workspace\xxx\temporary-junit-reports\TEST-xxx_Tests.TestsWithRealServers.TestWithTwoLocals_1_2.xml
      at hudson.tasks.junit.TestResult.parse(TestResult.java:306)
      at hudson.tasks.junit.TestResult.parsePossiblyEmpty(TestResult.java:244)
      at hudson.tasks.junit.TestResult.parse(TestResult.java:175)
      [...]
      ... 13 more
  Caused by: java.lang.NumberFormatException: empty String
      at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
      at sun.misc.FloatingDecimal.parseFloat(Unknown Source)
      at java.lang.Float.parseFloat(Unknown Source)
      [...]
  Archiving artifacts
  Finished: FAILURE
  </code></pre>
  
  <p>The XML file is present in the working directory. I mentioned that the first line of this file looks like this:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;testsuite errors="0" failures="0" name="xxx_Tests.TestsWithRealServers.TestWithTwoLocals" skipped="6" tests="6" time=""&gt;
  </code></pre>
  
  <p>So I guess it fails because the time attribe is empty.</p>
  
  <p>Does anyone how I can fix this or why this error occurs?
  Thanks!</p>