title: Publish code coverage result failed in azuredevops pipeline
body: <p>I have a .netcode test command and a publish code coverage results task in my pipeline.</p>
  
  <p>config as below:</p>
  
  <pre><code>steps:
  - task: DotNetCoreCLI@2
    displayName: 'Test Public API Project '
    inputs:
      command: test
      projects: '**/DWP.CDA.API.Test.csproj'
      arguments: '--output publish_output --configuration $(BuildConfiguration) /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura /p:Threshold=99 /p:ThresholdStat=total /p:CoverletOutput=$(Build.SourcesDirectory)\TestResults\Coverage\ --collect "Code coverage"'
  
  steps:
  - task: PublishCodeCoverageResults@1
    displayName: 'Publish code coverage'
    inputs:
      codeCoverageTool: Cobertura
      summaryFileLocation: '$(Build.SourcesDirectory)/TestResults/Coverage/*cobertura.xml'
      reportDirectory: '($(Build.SourcesDirectory)/Src/TestResults/Coverage'
  </code></pre>
  
  <p>But it seems that the publish results doed not take effect,such messages will show</p>
  
  <pre><code>[warning]No code coverage results were found to publish.
  </code></pre>