Missing property (value) in textDocument/hover result

[tejas-kale]

Environment data

Emacs version: 26.2
Extension version: 2019.1.1
OS and version: macOS Mojave (10.14.4)
Python version (& distribution if applicable, e.g. Anaconda): 2.7.16
Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
Relevant/affected Python packages and their versions: N/A

Issue

I use this language server along with a couple of Emacs packages (lsp-mode and lsp-ui). The latter errors out on hover when the language server returns "contents" without the 'value' property. This can be handled in the Emacs package itself. One of its maintainers though said (discussion) that this behaviour is inconsistent with the language server spec so reporting it here.

I am not sure if #383 discusses the same issue so pardon me for the redundancy. Let me know if any additional debug information is needed.

Debug info

[Trace - 05:08:19 PM]
Received response 'textDocument/hover - (54)' in 16ms.

Result: 
{
  "range": {
    "end": {
      "character": 21,
      "line": 714
    },
    "start": {
      "character": 15,
      "line": 714
    }
  },
  "contents": {
    "value": "percts",
    "kind": "plaintext"
  }
}




[Trace - 05:08:19 PM]
Received response 'textDocument/hover - (55)' in 16ms.

Result: 
{
  "range": {
    "end": {
      "character": 24,
      "line": 714
    },
    "start": {
      "character": 15,
      "line": 714
    }
  },
  "contents": {
    "kind": "plaintext"
  }
}




[Trace - 05:08:23 PM]
Sending request 'textDocument/hover - (59)'.

Params: 
{
  "textDocument": {
    "uri": "file:///Users/admin/code/test.py"
  },
  "position": {
    "line": 714,
    "character": 26
  }
}




[Trace - 05:08:23 PM]
Sending request 'textDocument/signatureHelp - (60)'.

Params: 
{
  "textDocument": {
    "uri": "file:///Users/admin/code/test.py"
  },
  "position": {
    "line": 714,
    "character": 26
  }
}




[Trace - 05:08:23 PM]
Received response 'textDocument/hover - (59)' in 160ms.

Result: 
null




[Trace - 05:08:23 PM]
Received response 'textDocument/signatureHelp - (60)' in 157ms.

Result: 
null