Request textDocument/hover failed

[david-waterworth]

Environment data

• VS Code version: 1.31.0
• Extension version (available under the Extensions sidebar): 2019.1.0
• OS and version: ubuntu 18.04
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.1
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): pyenv

Expected behaviour

If you create a new file and change language mode to magic python Output panel shouldn't fill with error messages when you move the mouse over code before saving the file

Actual behaviour

If you create a new file and change language mode to magic python Output panel fills with error messages when you move the mouse over code before saving the file

Steps to reproduce:

Ctrl+N to create a new file, change language mode to magic python but don't save file. Add code and move mouse over it.

log becomes full of error messages (made worse by an issue I've already submitted resulting in Output panel grabbing focus anytime a message is logged to it.

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

Error - 12:12:38 pm] Request textDocument/hover failed.
  Message: unknown document
  Code: -32000 
   at Microsoft.Python.LanguageServer.Implementation.ProjectFiles.GetEntry(Uri documentUri, Boolean throwIfMissing)
   at Microsoft.Python.LanguageServer.Implementation.ProjectFiles.GetEntry(TextDocumentIdentifier document, Nullable`1 expectedVersion, ProjectEntry& entry, PythonAst& tree)
   at Microsoft.Python.LanguageServer.Implementation.Server.Hover(TextDocumentPositionParams params, CancellationToken cancellationToken)
   at Microsoft.Python.LanguageServer.Implementation.LanguageServer.Hover(JToken token, CancellationToken cancellationToken)

[luabud]

Fixed upstream (microsoft/python-language-server#597)