title: Unable to add coverlet nuget package(s) - Version string portion was too short or too long
body: <p>When I try to add <code>coverlet.msbuild</code> to my test project I get this error:</p>
  <pre><code>The expression &quot;[System.Version]::Parse('')&quot; cannot be evaluated. Version string portion was too short or too long.  C:\my_repo\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.targets              
  </code></pre>
  <p>I do see changes to my csproj:</p>
  <pre><code>&lt;Import Project=&quot;..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.props&quot; Condition=&quot;Exists('..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.props')&quot; /&gt;
  
  &lt;Error Condition=&quot;!Exists('..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.props')&quot; Text=&quot;$([System.String]::Format('$(ErrorText)', '..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.props'))&quot; /&gt;
  &lt;Error Condition=&quot;!Exists('..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.targets')&quot; Text=&quot;$([System.String]::Format('$(ErrorText)', '..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.targets'))&quot; /&gt;
  
  &lt;Import Project=&quot;..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.targets&quot; Condition=&quot;Exists('..\packages\coverlet.msbuild.3.1.2\build\coverlet.msbuild.targets')&quot; /&gt;
  </code></pre>
  <p>But no changes to <code>packages.config</code>, so it looks like the nuget isn't actually installed.</p>
  <p>I'm trying to add this to a .net 4.8 test project.</p>
  <p>Any ideas to what may cause this?</p>