Switching language mode to Python on an unsaved file throws "Module path should be rooted"

[jakebailey]

Completions in untitled:Untitled-1 at (0, 8)
[Error - 10:40:55 AM] Request textDocument/completion failed.
  Message: One or more errors occurred. (Module path should be rooted)
  Code: -32000 
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at Microsoft.Python.LanguageServer.Implementation.Server.GetAnalysis(Uri uri, CancellationToken cancellationToken) in C:\Users\jabaile\python-language-server\src\LanguageServer\Impl\Implementation\Server.Documents.cs:line 72
   at Microsoft.Python.LanguageServer.Implementation.Server.Completion(CompletionParams params, CancellationToken cancellationToken) in C:\Users\jabaile\python-language-server\src\LanguageServer\Impl\Implementation\Server.Editor.cs:line 35
   at Microsoft.Python.LanguageServer.Implementation.LanguageServer.Completion(JToken token, CancellationToken cancellationToken) in C:\Users\jabaile\python-language-server\src\LanguageServer\Impl\LanguageServer.cs:line 238

To reproduce:

1. Open a new file in VSC, do not save.
2. Use the command palette to change the language mode to Python.
3. Try to use the analysis (completion, hover, etc).

The LS seems to analyze it, but breaks when it goes to serve a request.