Getting the build version fails for repositories cloned with --no-tags

[mkaring]

In case a repository is cloned with the --no-tags flag, Nerdbank.GitVersioning will fail in dotnet builds, due to the attempt to access a directory that does not exist.

Error Message

<snip>\out\nuget\nerdbank.gitversioning\3.7.112\build\Nerdbank.GitVersioning.Inner.targets(17,5): error MSB4018: The "Nerdbank.GitVersioning.Tasks.GetBuildVersion" task failed unexpectedly.
System.IO.DirectoryNotFoundException: Could not find a part of the path '<snip>\.git\refs\tags'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileSystemEnumerableIterator`1.CommonInit()
   at System.IO.FileSystemEnumerableIterator`1..ctor(String path, String originalUserPath, String searchPattern, SearchOption searchOption, SearchResultHandler`1 resultHandler, Boolean checkHost)
   at System.IO.Directory.EnumerateFiles(String path, String searchPattern, SearchOption searchOption)
   at Nerdbank.GitVersioning.ManagedGit.GitRepository.LookupTags(GitObjectId objectId)
   at Nerdbank.GitVersioning.Managed.ManagedGitContext.get_HeadTags()
   at Nerdbank.GitVersioning.VersionOracle..ctor(GitContext context, ICloudBuild cloudBuild, Nullable`1 overrideVersionHeightOffset)
   at Nerdbank.GitVersioning.Tasks.GetBuildVersion.ExecuteInner() in D:\a\1\s\src\Nerdbank.GitVersioning.Tasks\GetBuildVersion.cs:line 247
   at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
   at Microsoft.Build.BackEnd.TaskBuilder.<ExecuteInstantiatedTask>d__26.MoveNext() [<snip>\out\nuget\nerdbank.gitversioning\3.7.112\build\PrivateP2PCaching.proj]

This error was introduced by this pull request: #876

The first affected version is v3.7.112.
v3.6.146 works without issue.

[AArnott]

Excellent report and sleuthing. Thank you.